They seem to be preset to an already specific personality. Ani being the always clingy/flirty/possibly naughty goth loli AI persona. She might change over time as you feed her more info about yourself, er I mean, as you get to know each other. She might even adapt/alter depending on what version of Grok you use (I’m using Grok 3).

I’m thinking custom AI’s could be a thing but only if you pay for the priveliage. 🤷‍♂️