[quote=Gyrin]
Kai is mentally unstable.. He has a split personality disorder.. that is only triggered when his friends are in danger.. or anything.. like say if he can't cope with something his friends said.. something traumatizing.. his friends effect the disorder.
[/quote]

Trust me, Kai might be crazy, but there is nothing more terifying than a powerful psychopath who knows they're insane, can control himself enough to be social, and has no inhibitions at all.