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The "madness" referenced in Pathfinder/DnD books don't correspond to any real world mental disorders. It's the same type of thing as the more benign "madness" that deities like Zagyg have. I don't see many of them even having stuff like hallucinations. It's a plot device to allow for important NPC's that take irrational actions. Considering it's in a "kitchen sink" fantasy setting, the cause doesn't have to have anything to do with RL mental disorders at all either. You easily call it something different. Would that be alright or is the whole concept something to stay away from?
I completely agree that having more functional/loved/etc actually mentally ill characters would be awesome. I just don't think the fantasy "madness" used as a plot tool has much to do with it.