I am glad I read this thread in toto, it helped me put to words some of the stuff I wanted to write about concepts for my game, and some ways to suggest how to approach making those concepts work. You guys are awesome.
My own thoughts about other questionabe personality types? The troll. A character whose sole goal is to foment trouble with no goal other than to foment trouble. They can be fun in doses, but if every interaction is just LOL SO RANDUMB or ESCALATION, it's offputting and makes me not want to RP with you. And this is coming from someone who has played a deliberately troll-y character on a game. But I tempered it with losses, entire serious scenes that were almost mood whiplash, and allowing the people I was trolling to kick the shit out of me.