Hola!
From what I’ve seen lotsa peeps use AI just to get a general idea of the charas.
There’s some who personally draw their artworks too—plus a likely smaller few who commissioned others for said pieces.
(And a lil’ promotion cause why not?)
I made this thread if you’re interested:
https://forum.choiceofgames.com/t/free-art-yes-seriously/142813?u=meowmeow422