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<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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I do have a villain who is broken but he is not unbeatable, he is my general villain who I don't really get to use much. He is kind of like Thanos and Ultron. Thanos in terms of him needing to be gang banged or trapped in someway and Ultron in a way he keeps coming back no matter how hard you try to remove his presence. I have never written something like he blocks all attacks and strikes them all with an unblockable and swift counter. I always give chances for RPer's to counter them back though if it is for the story I may force it upon them, though it is not like I am killing them or anything.
Basically if someone just undermines everything you throw at them then you have a OP character, even worse when they know they are doing it but won't stop or write it in a very crap way. Oh when they agrue they are not broken also gets on my nerves where they won't leave and think it is cool just to write a post about how they killed or dominated everyone and everything.