7. Doctor Fate
This one might be a bit of a stretch because his similarity to the Marvel character Dr. Strange. They both certainly wear fancy capes and cast all sorts of spells. I think one way to make him unique is to combine some of the various versions of Doctor Fate that have existed over the years. One version of Fate required multiple people to merge into one being and work in tandem as the magic-user. You could even just make the helmet its own character because it is the one item that has passed from person to person every time Fate comes back.
Again I would reference all the various Justice League cartoons that so many kids grew up on. Fate has been featured prominently in many of those and so much of the younger fan audience would already know about him. Adding a mystical master would give DC the same thing that Dr. Strange gave Marvel: an olive branch into the world of magic. Putting magic into the world would add vulnerabilities to the overpowered characters like Superman or Wonder Woman. I realize he is a long shot, but doesn’t make him a bad addition to a future team.