[quote=@Anzu]
<Snipped quote by darkwolf687>

I've never seen insanity done well, I wouldn't do it on one of my characters as I don't think I know nearly enough, and people tend to use it as an excuse to act however they want. Someone with an actual mental illness would probably be pissed that something they have to deal with is used as an excuse to do whatever, and treated as if it makes them a deranged killer.

I feel like a lot of time anti-social personality traits like being blunt, are put as weaknesses to try and 'make up' for having a really strong character, without having an actual weakness. Fairly well definied limits on what their powers can do (not super pedantically, but what sort of opposition could defeat them in a fair fight, a rough idea of how much damage their attacks can do, etc) seems to really help this; vague, open to upwards interpretation power sections are an invitation to powerplay.
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People using mental illness as a weakness, like insanity, is why I specify that they need a physical weakness.