K` the warrior
True, like Gear said, if someone tried to attack him for whatever reason, they would fail miserably. It doesn't matter if the attacker is super-powerful or a wimp. This is good because it forces the opponent to think before attacking and it's also a good challenge. But here's the flaw I see.
You say 95% of the time, he's not all there. What about the other 5 percent? What if, for whatever reason, even if it's just ONCE in his life, he comes back around and attacks someone? Your opponents wouldn't stand a chance. Not only that, but since he lives in some unknown dimension, he's impossible to defeat.
So yeah, like someone said, he needs some other sort of major weakness to counterbalance his unique abilities. No no, I covered that. He only uses hand-to-hand combat, basically grappling. And when he touches you with bear-in-human-form type strength, he uses you as an anchor into this realm, so that way he can keep on attacking you. If he's using you as an anchor, you can hit him back.
In summary.
-He moves like Mr. Game-And-Watch. (T.Y. Gear, that made my day.)
-He exists outside of this dimension most of the time.
-He requires thinking and strategy to attack. (I like to make characters like this.)
-He's usually passive
-Very rarely, he has a smart moment
-Occasionally, when he feels urgency of people around him, he randomly casts magic. (I'm going to make a list of random effects eventually.)
-If he attacks you with his melee grapple attacks first, then you can attack him back.