I guess that Injustice's Joker for how he horribly turned Superman into a villain. I don't know the rest except Dolores Umbridge and King Runeard, but I would not punch old people.

I'd punch Tucker. He's a weakling with zero allies.

Joker would just enjoy it. Umbridge and Runeard would quickly and easily have me arrested or executed for my assault. Godolkin could sic his G-Men on me. Rip has the Nazis by his side.

It depends. If you meet Umbridge after she is send to Azkaban, then I think you can punch her with no consequences.

Are there even visitors in Azkaban? The place is surrounded by Dementors who could kiss you.

After the Second Wizarding War, Dementors are removed from Azkaban and replaced by Aurors. It's safe, pal.

Well, I'll still pick Tucker because I only hit girls in self-defense.

Well said, pal.