Well, the main thing that comes to mind when I read your OP, is:
KNOW what schizophrenia IS
I'm sure yall have thought and looked into it, but mental ilness has its stigmas, and false information out there.
You mention how the psychiatrist will be a pivital part of the game, so know the field.
I don't mean to be like, pointing out teh obvioud, but if not handled aproeriatelly, this could turn into a PR nightmare.
I don't expect you to tell me the personal story as to what inspired this game, but there likelly is one. And if there isn't, and your answer is, "oh, we/ I thought it'd be cool and set us appart" The I'll just say, do your research.
Jeff mention the right idea, but the wrong solution, introducing comorbidity may be interesting, but would complicate a lot of things, if you do this, have a good reason.
This might be of interest:
Sorry, I'm a psych major, so I have to think about these things.
Don't mean to be like this, but why did yall decide to do a 3rd person view for this?
It makes it more difficult to portray the mental illness symptoms in my mind, pun not intended.