So I just wanna offer up a fic idea that I most assuredly don't have sufficient knowledge to write. Danny joins the justice league as Phantom, and bc he looks like a kid, everyone decides that he needs a mentor. Who do they decide on? The one, the only Shazam (Captain Marvel? I think they're the same person?). Unfortunately for both of them, their powers disguise both their abilities, and Shazam is actually a child, while Phantom is actually an adult.

Cue crazy shenanigans as they both struggle to play their presumed role in this mess of a mentorship.