>>56958320>brotuberHe's a fraud and liar for starters. He makes up fake stories about "adventures" he went on and "crazy stuff" that happened, but they aren't actually true.
Regarding the mentally ill part, he has anger issues and cannot keep himself from overstepping boundaries. He literally clashed with management and Cover multiple times over his "I don't care, I know I'm not allowed to do x, but I'll do it anyway and deal with the consequences later" attitude.
Lastly, he was evidently only in Hololive to try and get with some of the girls in it, his vastly different behaviour and reactions to female collabs vs male ones showed as much.
He's a horndog and fraud and someone who has no business being in a Japanese corporation.