(Btw you get 1 clue if you’re really stumped)
…
Are you serious?
Rainbow Batman?
Nope
Aquaman?
I briefly considered Tula, but the artwork suggests an older image, and her armor didn’t have the same level of scale-like textures in her pre-Crisis appearances.
Nope.
Jimmy Olsen
Nope, but that is clever.
Fish person
What do you think?