set_random_eagle_personality_trait_effect

set_random_eagle_personality_trait_effect = {
	if = {
		limit = {
			NOT = { has_variable = eagle_personality_level }
		}
		set_variable = { name = eagle_personality_level value = 1 }
	}
	if = {
		limit = {
			has_character_modifier = eagle_story_modifier
		}
		remove_character_modifier = eagle_story_modifier
	}
	random_list = {
		10 = { 
			set_variable = { name = eagle_personality_trait value = flag:brave }
		}
		10 = { 
			set_variable = { name = eagle_personality_trait value = flag:curious }
		}
		10 = {
			set_variable = { name = eagle_personality_trait value = flag:loyal }
		}
		10 = { 
			set_variable = { name = eagle_personality_trait value = flag:calm }
		}
		10 = { 
			set_variable = { name = eagle_personality_trait value = flag:wise }
		}
		10 = { 
			set_variable = { name = eagle_personality_trait value = flag:cunning }
		}
	}
	if = {
		limit = {
			$ADD_MODIFIER$ = yes
		}
		add_eagle_personality_modifier_effect = yes
	}
}

As written in game/common/scripted_effects/00_animal_effects.txt.