CaptainXtra
STOP KOSA!
I’m guessing Joker is somewhat of a badass in his own right.
Similar to Batman, he has no powers yet rubs elbows with heroes and villains with much higher tiers of overall powers and somehow often comes out without a scratch on himself.
Joker is the kind of dude who not only makes a deal with the literal devil but actually makes the devil himself regret ever working with the clown prince of crime in the first place.