Stay away from his(?) powerful hind legs!
Mr.B is a formidable aerial attacker, raining down twirling glittering death from above. Alacrity aside, Mr.B has a scanty HP pool, but can evade grappling moves with piercing shrieks and cackles causing momentary -wtf- status.
The key to playing Mr.B well is always staying on the move and in the air. Too much downtime will send him into a spiralling pill-popping depression.