Larian Studios Forums Divinity - Original Sin Divinity Original Sin - Mods Custom Personality

Haven't tried this, but I believe if you copy the file:

/Data/Mods/Main/CharacterCreation/properties.lsx

to your mod using the same folder structure, you can open it in a text editor and look for the AiPersonalities section.
You should be able to add it to the bottom of the list (under Free Spirit).

the Handle field you should be able to set to "ls::TranslatedStringRepository::s_HandleUnknown"