Thank you for the feedback!
Unfortunately, when it comes to character art, I mostly rely on artists' generous donations. I consider myself very lucky to have people actually be interested enough to donate artwork that is in the game in the first place.
As for AI I have and still am tinkering with it quite a bit, but it is just impossible to get satisfactory generations even with highly specialized models, loras, etc. I've come really close with some but they always require a bit of editing to actually be good. I hold AI art to a completely different standard compared to man-made art, if I were to use AI art anything other than perfection just won't do.
In the future, I may add a portrait for a every character just as a placeholder so there's at least something there.