(A series wherein I propose the sweeping changes necessary to salvage these once-beloved characters)
J'onn J'onzz - The Martian Manhunter was once the heart and soul of the Justice League... and so he shall be again. I've never bought this paranoid, xenophobic (hypocritical much?) nutjob we've got now - what with his random fits of violent anger, and all...
So J'onn ought to be in the Justice League, while Cyborg is supposed to be in the Titans. Seems a simple enough solution, right? Why not just switch them out? Ah, but then you'd lose that diversity, you tell me. The answer there is easy, too.
What if Dr. Erdell - the man responsible for first bringing J'onn to Earth - had been African-American? And, in honoring that man after his death, the Manhunter takes on his appearance literally anytime he isn't in full-on superhero mode?