Character modding

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For adding operatives, see create_operative_leader, as they are not characters.

Characters are a system added in patch 1.11, allowing to use the same character for multiple roles, including different advisor types, country leaders and unit leaders. However, operatives are not considered characters and are still created with the create_operative_leader effect.

Characters are defined within /Hearts of Iron IV/common/characters/*.txt files and need to be recruited in /Hearts of Iron IV/history/countries/TAG*.txt files.. Note that while it's common to put the characters in a file with the name the same as the tag of the country, the filename does not actually matter aside from organisation and for overwriting previously-loaded files with the same name. Generic characters are typically created within /Hearts of Iron IV/history/general/*.txt files by using the generate_character effect, although it is to be noted that that folder is merely an effect block executed before startup, so other effects can be used there too.

Each character definition is contained within the characters = { ... } block, which encompasses the entirety of the file to mark them as characters. Each character is defined with a code block with the name of the character ID. For example, if the following is put within a file within the /Hearts of Iron IV/common/characters/ folder, the blank characters my_character_1 and my_character_2 will be created:

characters = {
    my_character_1 = {
    }
    my_character_2 = {
    }
}

Every character must be assigned to a country in that country's file in the /Hearts of Iron IV/history/countries/ folder by using the recruit_character = my_character effect. Recruitment cannot take place outside of country history. If the character is not recruited, they will never appear. Similarly to most other folders, the game does not care about neither the filename nor the name of the characters, which is why recruitment is mandatory.

Quick checklist

• The character is created in any /Hearts of Iron IV/common/characters/*.txt file with no regard to the filename:
  • name = TAG_loc_key uses a localisation key that's defined for the English language in any /Hearts of Iron IV/localisation/english/*_l_english.yml file.
  • portraits = { ... } use spriteTypes that are defined in any /Hearts of Iron IV/interface/*.gfx file.

    While it's common practice to store images in subfolders of /Hearts of Iron IV/gfx/ (usually /Hearts of Iron IV/gfx/leaders/ for country or unit leaders and /Hearts of Iron IV/gfx/interface/ideas/ for advisors), a sprite's texturefile can theoretically lead to any folder within the mod rather than being limited to /Hearts of Iron IV/gfx/.

• The character is assigned to a country using recruit_character in any history file, usually done in the country's corresponding /Hearts of Iron IV/history/countries/ file. This cannot be placed on the last line of the file.
• If the character isn't intended to have one of their roles at the start, then the character is created without that role, having it added with any effect block using add_country_leader_role, add_corps_commander_role, add_field_marshal_role, add_naval_commander_role, or add_advisor_role. Since add_advisor_role is limited in what is possible to add and what isn't, instead using visible = { ... } with a flag is an alternative for creating advisors.

Arguments

These arguments are within the character itself.

Name

主条目：Localisation

name = my_character defines a localisation key to be used to create the character's name depending on the language that is currently turned on. This will get localised in any working /Hearts of Iron IV/localisation/english/*_l_english.yml file, assuming the English language, as my_character: "My character's name"

Portraits

Portraits fall into 3 categories: civilian, army, and navy. Within these categories, the small and large decide whether it gets used as an advisor portrait or as a large portrait, used for country and unit leaders. Advisor portraits can be defined in any of the 3 categories, as long as it is a small portrait, while large portraits are specific to the category.
If there is no valid portrait definition for a role, a random pair of small-large portraits will be created for the role from the possible selection for the country/cosmetic tag in the /Hearts of Iron IV/portraits/*.txt files; if either category has a valid sprite definition for one size but not the other, the random generation will not happen for the size where a portrait has no sprite. An example with an advisor portrait, a country leader, and a corps commander portrait is the following:

portraits = {
    civilian = {
        large = GFX_my_country_leader_portrait
        small = GFX_my_advisor_portrait
    }
    army = {
        large = GFX_my_unit_leader_portrait
    }
}

The portraits themselves are defined in any /Hearts of Iron IV/interface/*.gfx file. By default, the game uses a wide variety of files, including /Hearts of Iron IV/dlc/dlc001_german_historical_portraits/interface/ghp_ideas_characters.gfx (loaded in-game as interface/ghp_ideas_characters.gfx) or /Hearts of Iron IV/interface/ideas.gfx, however, editing a base game file is never necessary: a file with a higher evaluation order decided by filename (Using ASCII character IDs to order) will overwrite any spriteType defined in an earlier file, which the game uses for replacing DLC portraits.
It is preferable to create a new file rather than overwriting base game files. This is done by creating a new file and renaming it, changing the extension to .gfx from .txt. Unhiding the file extension from the filename within the Windows file explorer is mandatory to do this if doing it on Windows.
Simplest possible definitions of portraits are defined using spriteType definitions within a larger spriteTypes = { ... } block as such:

spriteTypes = {
    spriteType = {
        name = GFX_my_advisor_portrait
        texturefile = gfx/foldername/advisor_filename.dds
    }
    spriteType = {
        name = GFX_my_country_leader_portrait
        texturefile = gfx/foldername/country_leader_filename.dds
    }
    spriteType = {
        name = GFX_my_unit_leader_portrait
        texturefile = gfx/foldername/army_leader_filename.dds
    }
}

The name of the spriteType has limitations: it must begin with GFX_ and be made up of one word total with no whitespaces or non-ASCII characters. The image file must match up with the folder and name specified in the sprite's texturefile with no other limits on the filename and folder location. If both restrictions are met, the sprite will work. The file extension, hidden by default on Windows, is a part of the filename. By default, the game stores advisor portraits in /Hearts of Iron IV/gfx/interface/ideas/, while country/unit leader portraits are stored in /Hearts of Iron IV/gfx/leaders/<TAG>/. The background used for country/unit leader portraits is found in /Hearts of Iron IV/tools/art/portrait_leader_background.png.

If a portrait doesn't work and is replaced with a randomly-selected one, there are two possible causes for this:

• The reference to the spriteType within the character definition is invalid. Check if the name = "" in the /Hearts of Iron IV/interface/*.gfx file is spelt in the exact same way as the portrait assignment in the character definition. This can also stem as an issue with the entire file, whether it's missing the spriteTypes = { ... } in the beginning or has the wrong file extension.
• The texturefile argument within the sprite is incorrect. Double-check not only the filename, but also the folders leading to it. Most commonly, this can be the wrong folder, omitting or having the wrong file extension in the sprite, using backslashes instead of forward slashes to separate the folders, or a regular typo in the filename.

Due to being affected by cosmetic tags, randomly-selected portraits get assigned only after country selection. Characters not assigned a valid portrait will show up as having no portrait or a default silhouette during the country selection process, only receiving a generic portrait after the game's start.

In regards to army leaders, a small portrait is also mandatory to exist as officer corps allow assigning officers as ministers. There are two primary ways to ensure about creating it:

• Manually specifying the portrait within portraits = { ... }.
• Creating another sprite to serve as the small portrait, which consists of the large portrait with a _small suffix. This also works for randomly-chosen portraits defined within /Hearts of Iron IV/portraits/*.txt files. If the character has army = { large = GFX_my_unit_leader_portrait }, then the following definition will work for creating a sprite that'll assign the minister portrait as soon as they get promoted:

spriteTypes = {
    spriteType = {
        name = GFX_my_unit_leader_portrait_small
        texturefile = gfx/foldername/officer_minister_filename.dds
    }
}

Similarly to all other sprites, animated portraits can be done by creating a frameAnimatedSpriteType instead of a regular spriteType.

Gender

This is primarily used in some localisation namespaces to select the pronouns for the character. Possible values are undefined, male, and female. The default is gender = undefined. If the name or the portrait are not defined, gender is used to automatically generate them. In almost all respects, gender = undefined behaves like gender = male. If a character created dynamically with generate_character has undefined gender, it will be randomly assigned using FEMALE_UNIT_LEADER_BASE_CHANCE or, if the character can exclusively be a unit leader, based on the female attribute of the unit leader definition.

Advisors

A character has an advisor role added by defining one within the advisor = { ... } block. This definition is similar to ideas in many ways, but there are a few extra arguments:

slot = political_advisor is used to determine the character slot on the country politics view that the character occupies. By default, these character slots exist in the base game:

Internal name	Localised name	Intelligence ledger	Category	Notes
political_advisor	Political advisor	Civilian	Laws & Government
theorist	Theorist	Invalid	Research & Production	The ledger must be specified for each theorist individually as, for example, ledger = navy. Possible values are army, air, navy, military (Appearing on each of the prior ledgers), civilian, all, and hidden.
army_chief	Chief of Army	Army	Military Staff
navy_chief	Chief of Navy	Navy	Military Staff
air_chief	Chief of Airforce	Air	Military Staff
high_command	Military High Command	Invalid	Military Staff	The ledger must be specified for each theorist individually as, for example, ledger = navy. Possible values are army, air, navy, military (Appearing on each of the prior ledgers), civilian, all, and hidden.

idea_token = my_character is the ID used for the character when treated as an idea within this particular slot. For example, the has_idea trigger or the show_ideas_tooltip effect do not expect the character ID, but the idea token of the character instead. Since it is impossible to have two of the same idea, any other character with the same idea token will be impossible to take. As not having an idea token is treated as having a null one, this is mandatory. Otherwise, recruiting this character will make every other advisor without an idea token specified disappear from the selection.

can_be_fired = no assigns the advisor as impossible to fire manually. Note: Prior to 1.12.8, removal_cost = -1 could've been used for this purpose, but this does not work after the patch.

Everything else regarding advisors is identical to ideas. Commonly, the traits = { ... } block is used, where each country leader trait that the character has is listed, separated with a whitespace, as traits = { my_trait_1 my_trait_2 }. These would apply modifiers on the country if the advisor is recruited, as well as adding a subtext and an icon in the bottom right of the advisor's picture.
available, cost, and visible arguments are also common.
on_add = { ... } and on_remove = { ... } attributes use the character scope instead of the country scope as they do in ideas. In order to scope into the country that the advisor is assigned to, use the owner scope.

Adding the same character to multiple different character slots is done by defining advisor = { ... } multiple times.

Example:

advisor = {
    slot = theorist
    idea_token = my_character
    ledger = army
    traits = { military_theorist }      # Unspecified cost defaults to 150.
}

Country leaders

参见：Ideology modding

Country leaders are defined with the country_leader = { ... } block. The following arguments can be used within:

ideology = socialist is the ideology type that the leader is assigned. An ideology group (such as 民主主义) cannot be assigned here directly, rather ideology types are defined for each leader to decide the ideology group the party of which the character leads.
The difference between ideology types is mostly cosmetic, changing the description shown when hovering over the ideology icon and, if defined so, the icon itself. Additionally, countries with the same ruling ideology group but a different leader ideology type will have the Same Ideology （ 关系 +10） modifier towards each other, while countries with the same leader ideology type will have the Same Ruling Party （ 关系 +20） modifier towards each other.
These are the ideology types in base game across groups, defined in /Hearts of Iron IV/common/ideologies/*.txt:

Internal name	Localised name	Ideology group	Notes
conservatism	Conservatism	democratic
liberalism	Liberalism	democratic
socialism	Socialism	democratic
marxism	Marxism	communism
leninism	Leninism	communism
stalinism	Stalinism	communism
anti_revisionism	Anti-Revisionism	communism
anarchist_communism	Anarchist Communism	communism
nazism	Nazism	fascism
gen_nazism	Nazism	fascism	Generic in the sense that the description is changed to not reference Germany.
fascism_ideology	Fascism	fascism
falangism	Falangism	fascism
rexism	Rexism	fascism
despotism	Despotic	neutrality
oligarchism	Oligarchic	neutrality
anarchism	Anarchism	neutrality	Cannot be randomly selected. Has a unique ideology icon.
moderatism	Moderatism	neutrality
centrism	Centrism	neutrality

traits = { my_trait_1 my_trait_2 } is, similarly to advisors, a list of country leader traits that the country leader has, which would apply modifiers on the country if the character is leading the country.

expire = 1949.1.1 marks the date at which the leader expires. If the start date is after this amount, they cannot be used, even if recruited. Optional.

id = 100 is a leftover from the pre-NSB country leader system, making the leader have the specified ID for the has_country_leader trigger. As it's possible to specify the character itself in the trigger, defining an ID is unnecessary. Leaving it out completely or setting to -1 will make the character not have one.

desc = MY_LEADER_DESCRIPTION is the localisation key that gets used for the leader's description depending on the currently turned on language. This must be a localisation key, a directly-defined description will not appear in-game.

Example:

country_leader = {
    ideology = centrism
    desc = MY_LEADER_DESCRIPTION
}

If a country leader is recruited in the country history file, then they will be attempted to be placed as the leader of their parties. That will fail if there is already a suitable leader for the party. This can happen in two circumstances:

• A different character is already recruited as the party leader. In other words, in case of overlap between political parties in different characters, the game will place the first-recruited one as the party leader.
• A randomly-generated character is forced to be created prior to recruitment. This can be caused by a different character being fired from their slot as the political party leader (such as if the leader needs to change between start dates) or, in some cases, by set_politics = { ... }. It's best to recruit characters before setting the political information for the country and in case of differences between startdates, ensuring that the character intended to replace the old leader is recruited before the old leader is retired.

Unit leaders

Unit leaders include corps commanders, field marshals, and admirals. Respectively, these use corps_commander = { ... }, field_marshal = { ... }, and navy_leader = { ... } blocks for definition, which are similar in structure.

traits = { my_trait_1 my_trait_2 } is the list of unit leader traits assigned to the unit leader, defined in /Hearts of Iron IV/common/unit_leader/*.txt.

skill = 4 is the overall skill level of the unit leader. In addition, specific skills also can be set, with attack_skill = 3 and defense_skill = 2 being shared across all unit leaders, planning_skill = 5 and logistics_skill = 6 being only for army leaders, and coordination_skill = 3 and maneuvering_skill = 5 being only for navy leaders. To put what each skill level grants to the leader in more detail:

Internal name	Localised name	Unit leader type	Effect per level
skill	Skill	Any unit leader	Army leaders: Nothing Navy leaders: +5% hit chance, +2% fleet coordination.
attack_skill	Attack	Any unit leader	Army leaders: +2.5% offense Navy leaders: +5% damage
defense_skill	Defense	Any unit leader	Army leaders: +2.5% defense Navy leaders: +5% defense
planning_skill	Planning	Army leaders only	+5% planning speed +2% max bonus from planning
logistics_skill	Logistics	Army leaders only	-2.5% supply consumption
maneuvering_skill	Maneuvering	Navy leaders only	+2.5% positioning +1% naval retreat speed
coordination_skill	Coordination	Navy leaders only	+2% fleet coordination

legacy_id = 100 is a leftover from the pre-NSB country leader system, making the leader have the specified ID for the has_id trigger, the has_unit_leader trigger, the start_civil_war effect for keeping unit leaders, and elsewhere. Defining an ID is unnecessary in most cases, as there are alternatives to any usage of an ID. Leaving it out completely or setting to -1 will make the character not have one.

visible = { ... } is a trigger block that the character must fulfill in order for the unit leader to be visible and possible to pick. Additionally, country-scoped triggers are also supported, which'll assume the country that recruited the character. Unnecessary in most cases, as it's possible to create the unit leader role within an effect block mid-game.

Examples:

field_marshal = {
    traits = { my_trait_1 my_trait_2 }
    skill = 10
    attack_skill = 8
    defense_skill = 1
    planning_skill = 10
    logistics_skill = 10
}
corps_commander = {
    skill = 1
    attack_skill = 2
    defense_skill = 3
    planning_skill = 4
    logistics_skill = 5
}
navy_leader = {
    skill = 3
    attack_skill = 1
    defense_skill = 3
    maneuvering_skill = 5
    coordination_skill = 4
    legacy_id = 10
    visible = { has_stability > 0.3 }
}

Full example

Within any /Hearts of Iron IV/common/characters/*.txt file

characters = {
    UKR_nestor_makhno = {
        name = UKR_nestor_makhno
        portraits = {
            civilian = {
                large = "GFX_portrait_UKR_nestor_makhno"
            }
        }
        country_leader = {
            ideology = anarchist_communism
            traits = { agrarian_activist }
            desc = UKR_nestor_makhno_desc
        }
    }
    SOV_georgy_zhukov = {
        name = SOV_georgy_zhukov
        portraits = {
            army = {
                small = "GFX_idea_georgy_zhukov"
                large = "GFX_portrait_SOV_georgy_zhukov"
            }
        }
        corps_commander = {
            traits = { media_personality armor_officer war_hero winter_specialist }
            skill = 5
            attack_skill = 5
            defense_skill = 2
            planning_skill = 4
            logistics_skill = 5
            legacy_id = 410
            visible = { NOT = { has_character_flag = SOV_exiled_flag } }
        }
        advisor = {
            slot = theorist
            idea_token = georgy_zhukov
            ledger = army
            allowed = { original_tag = SOV } # Optional, doesn't change anything.
            available = {
                has_completed_focus = SOV_positive_heroism
            }
            traits = { mass_assault_expert }
        }
    }
}

Within any /Hearts of Iron IV/history/countries/*.txt file:

recruit_character = UKR_nestor_makhno
recruit_character = SOV_georgy_zhukov

Instances

It is also possible for a character to have a different definition depending on set preconditions checked at the game's start. This is done with instance = { ... }. The character will take on every instance where allowed = { ... } is true at the game's start. For example, this can be used to make the character to have a different role depending on which DLCs the player has enabled:

my_character = {
    instance = {
        allowed = { has_dlc = "Poland: United and Ready" }
        advisor = {
            slot = political_advisor
            traits = { polish_person }
        }
    }
    instance = {
        allowed = { NOT = { has_dlc = "Poland: United and Ready" } }
        corps_commander = {
            skill = 10
            attack_skill = 10
            defense_skill = 10
            planning_skill = 10
            logistics_skill = 10
            traits = { not_polish_person }
        }
    }
}

Due to its purpose, each instance must have an allowed block and the character must have multiple instances to work properly. If the character only has a single pre-determined state, then the instance should be omitted.

Using in-game

参见：Effect

After being created, a character is mandatory to be assigned to a country. Since the filenames are only used for organisation purposes, this is done within the country's history file (in /Hearts of Iron IV/history/countries/) as such:

recruit_character = TAG_character_name

If this is not done, the character cannot ever be used. The recruitment will fail if the effect is placed as the last line in the file: there must be at least one line after the recruitment, even if it's empty.

If the character has a country leader role, they will be automatically promoted to be the leader of the party of the ideology group that contains the leader's ideology type. If there are several characters that fill this role, then the first-recruited one is selected. For example, let's say that the country history file has the following:

recruit_character = TAG_liberal_leader      # 'ideology = liberalism', falls under democratic
recruit_character = TAG_conservative_leader # 'ideology = conservatism', falls under democratic
set_politics = {                            # Since set_politics forces a leader to come to power, this will create
    ruling_party = democratic               # a randomly-generated character if no country leader has yet been recruited.
    elections_allowed = no                  # Due to this, set_politics must be placed after character recruitment.
}

In this case, TAG_liberal_leader will be the character that gets assigned to be a leader.

If a character is not intended to be the leader of a political party initially but get it later on, it's best to define them as an initially empty character, such as the following for a country leader:

characters = {
    TAG_new_leader = {
        name = TAG_new_leader
        gender = female
        portraits = {
            civilian = {
                large = GFX_portrait_TAG_new_leader
            }
        }
    }
}

This character should still be recruited with recruit_character = TAG_new_leader
After doing so, this character can be given a role within an effect block. Usually it's better to also retire the old leader of that political party to ensure that they aren't able to come back to power, though this shouldn't be done if they are intended to do so. For example, this completion reward for a focus retires the current country leader and makes a character lead the democratic party:

completion_reward = {
    retire_country_leader = yes # Assumes that the political party whose leadership changes is currently ruling.
    add_country_leader_role = {
        character = TAG_new_leader  # Must be recruited
        promote_leader = yes
        country_leader = {
            ideology = conservatism
            traits = { my_trait }
        }
    }
}

Effects on this topic include add_country_leader_role, add_corps_commander_role, add_field_marshal_role, add_naval_commander_role, and add_advisor_role. Since add_advisor_role is limited in what is possible to add and what isn't, instead using visible = { ... } with a flag is an alternative for creating advisors.

In order to hire an advisor to be within their proper slot, activate_advisor is used as such:

activate_advisor = TAG_character_name

As an effect, this works within country history files as well.

Country leader traits

"Trait modding" redirects here. For unit leader traits, see § Unit leader traits

Despite their name, country leader traits can be applied to either advisors, ideas, or country leaders. Country leader traits are defined in any /Hearts of Iron IV/common/country_leader/*.txt file.
The traits' modifiers will apply to the country that has the character or idea on which the trait is applied.
Traits in the file are contained within the leader_traits = { ... } block, and will not work otherwise.

An example trait file is defined as following:

leader_traits = {
    my_trait = {
        random = no
        sprite = 1
        political_power_gain = 0.1
        equipment_bonus = {
            train_equipment = {
                build_cost_ic = 0.05
                reliability = 0.15
            }
        }
        ai_will_do = {
            base = 2
        }
        command_cap = @tier1
    }
}

Within country leader traits, these are the arguments that are used:

• random = no decides whether there's a possibility that a randomly-created country leader can appear with this trait.
• sprite = 1 decides the sprite that appears in the bottom left of an advisor that has this trait. This must be a number, which corresponds with the frame of the GFX_idea_traits_strip spriteType, defined within /Hearts of Iron IV/interface/ideas.gfx by default. Optional.
• ai_will_do is a MTTH block that modifies the chance for AI to pick an advisor or idea that has this trait assigned. 1 by default.

• command_cap determines the price of the political advisor to which this trait is assigned in Command power. Mainly applied to military advisors.

Additionally, special modifier types that can be used in ideas: targeted_modifier = { ... } and equipment_bonus = { ... } - can be used within traits alongside regular modifiers, in the exact same manner as within ideas. The same does not apply to research_bonus = { ... } and rule = { ... }, however.

Localisation is defined by using the trait's name as a localisation key within any localisation file, with an entry as my_trait: "My trait".

Sprite

参见：Sprite overview

The sprite = 1 argument decides shown on the paper for the advisor when an advisor has this. This uses the GFX_idea_traits_strip spriteType, which can be defined in any /Hearts of Iron IV/interface/*.gfx file, by default ideas.gfx. However, it's generally better to avoid overlap in files from the base game to decrease the needed amount of work to make the mod be up to date. Instead, it's possible to overwrite the sprite in a new file.
In particular, in case of there being defined several spriteTypes with the same name, the game picks the one that was evaluated later. The filename is used to order the files for the evaluation, using ASCII order, so a file later in that order may contain an overriding sprite. For example, it may be interface/xyz_override.gfx, since "x" is later than "i" in the ASCII alphabet. This may be its contents:

spriteTypes = {
	SpriteType = {
		name = "GFX_idea_traits_strip"
		texturefile = "gfx/interface/ideas/idea_traits_strip.dds"
		noOfFrames = 18 # Base game contains this many as of 1.12
	}
}

noOfFrames decides on the number of sections that the file is separated into, always horizontally. For example, with 3, it'd be divided into the left third (frame 1), middle third (frame 2), and the right third (frame 3). This is used in the sprite of the trait: sprite = 1 would pick frame 1 and thus the left third, while sprite = 3 will pick the right third.

In particular, these are the important notes:

• It is mandatory to change the noOfFrames if the image is changed from the base game's default
• Base game's ideas.gfx should not exist within the mod in most cases. If the image for the trait strip is edited, it will not break the mod as much upon game updates to keep it copied, however any newly-added sprites will become unusable unless manually ported over, which can be avoided by just using a different file for new sprites.

Unit leader traits

Units leader traits are defined in any /Hearts of Iron IV/common/unit_leader/*.txt file, possible to assign to unit leader characters of any type as well as operatives. Each one is defined within the leader_traits = { ... } block as a separate entry with the name of the trait's ID.

Localisation

Localisation is defined by using the trait's name as a localisation key within any localisation file, with an entry as my_trait: "My trait". A description can be added by appending _desc to the end as my_trait_desc: "My description".

GFX

The picture is defined in any /Hearts of Iron IV/interface/*.gfx file as a spriteType with the name of GFX_trait_<trait's name>. As an example with a trait of the name not_polish_person, a sprite definition with the name of GFX_trait_not_polish_person will be used. If the trait's name begins with trait_, then the sprite DO NOT NEED to double trait_. For example, trait_example's sprite will be defined as GFX_trait_example. The /Hearts of Iron IV/interface/*.gfx file containing both sprites will have these contents:

spriteTypes = {
    spriteType = {
        name = GFX_trait_not_polish_person
        texturefile = gfx/foldername/filename.dds
    }
    spriteType = {
        name = GFX_trait_example
        texturefile = gfx/foldername/filename.dds
    }
}

General arguments

Argument	Value type	Example	Effects	Notes
type	Type(s)	type = corps_commander type = { land navy }	Assigns a type to the trait, which gets used to assign which characters are able to receive it.	The types include all, land, navy, operative, corps_commander, and field_marshal
trait_type	Trait type	trait_type = corps_commander	Assigns a type to the trait, which gets used to assign where it's positioned on the user interface, as well as deciding if and when it's possible to assign.	The types include basic_trait (for operatives), personality_trait, assignable_trait, basic_terrain_trait, assignable_terrain_trait, status_trait, and exile
show_in_combat	Boolean	show_in_combat = yes	Makes this specified trait show up in the combat menu among other bonuses.
allowed	Triggers	allowed = { FROM = { tag = POL } }	Triggers that are checked when trying to assign the trait to a unit leader, making it fail to assign if false. Checked in the scope of the unit leader.	FROM is the country that recruited the character.
ai_will_do	MTTH block	ai_will_do = { base = 3 modifier = { FROM = { tag = POL } } }	Decides the weight that AI has for picking this trait.	A weight of 0 will result in AI never picking it.
new_commander_weight	MTTH block	new_commander_weight = { base = 0 }	Decides the weight that the trait has for new randomly-generated unit leaders.	A weight of 0 will result in it never appearing for randomly-generated unit leaders. Only can be defined for traits with the personality_trait type.
slot	Character slot	slot = army_chief	Decides which advisor slot gets used by the officer corps role that can be assigned to this unit leader.
specialist_advisor_trait	Country leader trait	specialist_advisor_trait = my_trait	Creates a specialist officer corps role that can be assigned to this unit leader using the specified advisor trait as the base.
expert_advisor_trait	Country leader trait	expert_advisor_trait = my_trait	Creates a expert officer corps role that can be assigned to this unit leader using the specified advisor trait as the base.
genius_advisor_trait	Country leader trait	genius_advisor_trait = my_trait	Creates a genius officer corps role that can be assigned to this unit leader using the specified advisor trait as the base.
unit_type	type = <sub-unit type>	unit_type = { type = infantry type = militia }	Limits the selection of units on which the modifiers can apply on to those that have the sub-unit in a composition.	Sub-units are defined within /Hearts of Iron IV/common/units/*.txt files. In order for it to apply those that are majority-made out of a sub-unit, division_has_majority_template can be used in unit_trigger.
unit_trigger	Triggers	unit_trigger = { division_has_majority_template = camelry owner = { neutrality > 0.5 } }	Applies a division-scoped trigger block that must be met for the unit to be modified.

Modifiers and effects

These arguments are for the modifiers that the trait gives to the unit leader, whether it's the modifiers themselves or something related to them, as well as effects executed related to the trait.

Argument	Value type	Example	Effects	Notes
modifier	Modifiers	modifier = { planning_speed = 0.2 urban = { movement = 0.1 } }	Assigns the modifiers that the trait grants to the divisions that the unit leader leads.	Possible to specify the terrain by scoping into it. Terrain types are defined in /Hearts of Iron IV/common/terrain/*.txt.
non_shared_modifier	Modifiers	non_shared_modifier = { experience_gain_factor = 0.3 }	Assigns the modifiers that the trait grants to the unit leader themselves.	While in theory identical to the prior modifier, this has a different tooltip, so it shows up differently in-game.
corps_commander_modifier	Modifiers	corps_commander_modifier = { max_commander_army_size = 3 }	Assigns the modifiers that the trait grants to the army leader when in the role of a corps commander, i.e. leading units directly rather than leading other generals.	If a field marshal is assigned to lead divisions directly rather than other generals, this will apply on them.
field_marshal_modifier	Modifiers	field_marshal_modifier = { supply_consumption_factor = 0.5 }	Assigns the modifiers that the trait grants to the army leader when in the role of a field marshal, i.e. leading other generals that lead divisions.	If a field marshal is assigned to lead divisions directly rather than other generals, this will not apply on them.
sub_unit_modifiers	Modifiers	sub_unit_modifiers = { artillery_brigade = { max_strength = 0.1 } }	Assigns the modifiers that the trait grants to the division brigades that make up the divisions that the army leader leads or, similarly, ships that make up the fleet that the navy leader leads.	Brigades are defined in /Hearts of Iron IV/common/units/*.txt. What's used in the definition as arguments is possible to apply as a multiplicatory sub-unit modifier.
<skill type>	Integer	attack_skill = 2	Adds a flat bonus to the specified skill.	The list of skills defined for unit leaders earlier in the page
<skill type>_factor	Percentual	defense_skill_factor = 1	Adds a multiplicatory bonus to the specified skill. 1 would add 100%, doubling it, for example.	The list of skills defined for unit leaders earlier in the page
override_effect_tooltip	Localisation key	override_effect_tooltip = my_effect_tt	Hides the effects of the trait, replacing the tooltip with the value of this localisation key.	English localisation is defined in any /Hearts of Iron IV/localisation/english/*_l_english.yml file. Similarly for other languages.
custom_effect_tooltip	Localisation key	custom_effect_tooltip = my_effect_tt	Appends the value of this localisation key to the tooltip showing the effects of the trait.	English localisation is defined in any /Hearts of Iron IV/localisation/english/*_l_english.yml file. Similarly for other languages.
enable_ability	Ability	enable_ability = my_ability	Enables an ability that can be used by the unit leader in combat.	Abilities are defined in /Hearts of Iron IV/common/abilities/*.txt
on_add	Effects	on_add = { promote_leader = yes }	Defines the effects that would be executed on the unit leader when the trait is added.
on_remove	Effects	on_remove = { remove_unit_leader = yes }	Defines the effects that would be executed on the unit leader when the trait is removed.
daily_effect	Effects	daily_effect = { gain_xp = 1 }	Defines the effects that would be executed on the unit leader every day if they have the trait.

Selection

These arguments are related to the menu for selecting traits. This includes experience. If the trait is manually assigned only, these can be omitted.

Argument	Value type	Example	Effects	Notes
mutually_exclusive	Trait	mutually_exclusive = my_trait	Makes the specified trait mutually exclusive with the other trait, making it impossible to pick if that one was selected and drawing the arrows in the menu.	Both traits require defining this to work properly.
parent	Trait	parent = my_trait	Makes the specified trait be marked as a parent, making it be required to pick the current trait and drawing the line in the menu.	Multiple parents can be specified by defining parent = my_trait_2 several times.
num_parents_needed	Integer	num_parents_needed = 3	Sets the required amount of parents needed to select the trait.	If omitted or set to -1, then assumes that all parents are necessary.
gui_row	Integer	gui_row = 3	Sets the row on which the trait is located.	If omitted or set to -1, then one on the top is picked. Starts with 0.
gui_column	Integer	gui_column = 3	Sets the column on which the trait is located.	If omitted or set to -1, then one is automatically picked depending on the trait_type.
prerequisites	Triggers	prerequisites = { defense_skill_level > 3 }	Triggers that must be met in order for assigning the trait to be possible.	Checked in the unit leader scope.
custom_prerequisite_tooltip	Localisation key	custom_prerequisite_tooltip = my_prerequisite_tt	Changes the tooltip of the conditions required for picking the trait to the following localisation key. Useful if a trigger within has no tooltip.	English localisation is defined in any /Hearts of Iron IV/localisation/english/*_l_english.yml file. Similarly for other languages.
cost	Decimal	cost = 1500	The experience required in order to assign this trait to a unit leader.
gain_xp	Triggers	gain_xp = { is_amphibious_invasion = yes }	Triggers that must be met in order to gain experience that'd make assigning this trait possible.	Checked in the combatant scope.
gain_xp_leader	Triggers	gain_xp_leader = { num_units > 10 }	Triggers that must be met in order to gain experience that'd make assigning this trait possible.	Checked in the unit leader scope.
gain_xp_on_spotting	Decimal	gain_xp_on_spotting = 7	The amount of experience gained when the admiral spots an enemy fleet.
custom_gain_xp_trigger_tooltip	Localisation key	custom_gain_xp_trigger_tooltip = my_prerequisite_tt	Changes the tooltip of the conditions required for gaining experience for the trait to the following localisation key. Useful if a trigger within has no tooltip.	English localisation is defined in any /Hearts of Iron IV/localisation/english/*_l_english.yml file. Similarly for other languages.
trait_xp_factor	Triggers	trait_xp_factor = { my_trait = 0.1 }	Modifies the amount of experience gained towards other traits if the unit leader has this trait.	0.1 would mean that the unit leader gains 10% more experience, not that it gains 10% as much.

Example

leader_traits = {
    my_trait_1 = {
        type = { land navy }
        trait_type = personality_trait
        non_shared_modifier = {
            promote_cost_factor = -0.5
        }
        attack_skill_factor = 1
        new_commander_weight = {
            factor = 0  # Scripted starting leaders only
        }
    }
    my_trait_2 = {
        type = land
        gain_xp = {
            num_units > 10
        }
        cost = 3000
        field_marshal_modifier = {
            org_loss_when_moving = -0.30
        }

        slot = army_chief
        specialist_advisor_trait = army_chief_trait_1
        expert_advisor_trait = army_chief_trait_2
        genius_advisor_trait = army_chief_trait_3
        ai_will_do = {
            factor = 10
        }
        trait_type = assignable_trait
        gui_row = 10
    }
}

References

模组制作