Yeah their called young justice because they need a freaking nap

Marvel: He’s not dangerous! He’s just a kid with no one to play with. He just needs a friend.

Batman: He almost caused several fatalities during his last appearance-

Marvel: Yeah, he was bored! He has this mountain of power and nowhere to put it. He’s focusing on the League because we have enough power to play at his level. He doesn’t mean any harm, Mister Batman, he just wants to be around people who understand him...

Green Lantern: So what then? You want us to open a daycare for him? Play board games? Video games?

Marvel: Of course not. He would hate that. But… it’s not a completely bad idea. Me and the other magic users could try to befriend him. We have more than enough magic and knowledge to handle his pranks without anyone getting seriously hurt. And it would keep him away from civilians.

Arthur (Aquaman): I don’t think Doctor Fate is going to enjoy babysitting with you, Cap.

Superman: But maybe we could give it a try, right? It’s not a bad idea- if it works.

Red Tornado: Based on the data I’ve collected as the 'mother hen' of Young Justice… I’d say "it’s worth a shot". Klarion is still a kid, as Captain Marvel pointed out. Kids with abilities like his could benefit from the company of others who understand them. It might even help him feel normal, accepted. And if it works, the chances of us becoming the target of Klarion’s boredom again would decrease significantly.

Batman: Captain Marvel, are you sure you can do this? I can’t promise the other magic users will join you. As you know, many of them don’t exactly appreciate Klarion’s brand of magic.

Marvel: Sure thing, Mister Batman! I can handle Klarion, no problem.

So Marvel goes off to find Klarion and tries talking to him.

Later, he reports back to the League that things are going well. Klarion agreed not to attack, as long as Marvel plays with him every now and then.

But one day, during a League meeting that’s dragging on way too long, Klarion invades the Watchtower, wearing a scowl that could melt stee

Klarion: Captain! You’re twenty minutes late! You promised to introduce me and Teekl to that magical tiger of yours!

Marvel: Oh, yeah. Sorry, Klarion. I didn’t realize how long this was taking... Er, Batman, sir-- would it be alright if I leave early?

Batman: Hmm… You’re dismissed for now, Marvel.

with that, the League watches as Marvel smiles, and in a flash of light, he transforms into a kid. Not Billy, but a smaller, more casual version of Marvel.

He runs up to Klarion, gives him a high five, and together they disappear through a magical portal.