Origin

Mickey is the secret son of Mr. Mxyzptlk, so secret even his dad might not know he exist. He has the same powers as his father, but is even more childish than the old imp. He grew up looking into the DC universe as a form of entertainment.

Major Story Arcs

During the DC event, Dark Crisis, Mickey took advantage of Young Justice's grief to create a fantasy world that took liberties from 90s comics. The Justice League was alive again, Alfred Pennyworth was alive again, and plenty of Young Justice's villain were active again. He brought the male members of the team to this world, where he disguised himself as Wonder Girl (Who was really left behind on Earth) as a way to manipulate the young heroes into staying, trying to convince them it was for the best since plenty of those they love were now long dead.

Mickey would display biphobic and sexist behavior, trying to convince Tim Drake that he wasn't bisexual using Batman as a way to tell him it was a phase and there was no such thing as bisexuality. This however was a mistake, since Tim already knew he was bi at this point. This lead Tim into figuring out the world was fake. This wouldn't be Mickey's only mistake, he would forget members of the league, and villains personalities, showing he wasn't as much of a fan as he thought he was.

Mickey was forced to reveal himself once Wonder Girl, Red Tornado and Arrowette broke into this fictional world to save their friends. Mickey once again make a common mistake, thinking of Wonder Girl as a "sex object" who looked better in her old costume, and thinking of Bart Allen as foolish, this mistake would cause him to underestimate the two heroes who would be the ones to defeat him.