• He has anger issues

 • He can get violent sometimes

 • His ink drips from his face when he's upset/angry

 • Can't control himself sometimes 

 • He can turn back into normal Sinny, but it's very rare. And when he does, it hurts him a lot 

• He kinda has poor eyesight

• Bad End Cuphead is the only person that can help calm him down.

• He can use his eyes to hypnotize people.

• He doesn't really like the Devil and hates Cerberus.