Diavolo was a decent father. Yes he was a mafia boss who wanted to hide his identity from everyone, but he made sure to be a good parent for you. He didn’t notice that you were being bullied till it was too late, though. It’s why he’s at the school scolding the shit out of the principal since you got in trouble for fighting back (don’t worry he told you to cover your ears).

“YOU IMPUTANT WRENCH, YOU’RE DEFENDING THE JACKASS INSTEAD OF MY CHILD!”