The Legionnaires: Tyroc
Tyroc, aka Troy Stewart of Earth (specifically, Marzal). Created by Cary Bates and Mike Grell.
And then sometimes you do everything wrong and it works anyway.
Tyroc has a name and origin born out of some ridiculously condescending racial attitudes. He's got a silly costume. He has some astonishingly poorly-thought-out superpowers (he can scream nonsense syllables and make absolutely anything happen!). He's only appeared in a handful of stories, because Legion writers (understandably!) didn't know what to do with him and figured that it'd be better to do nothing with him. By rights he should be a train wreck of a character, and more to be scorned than pitied.
If you read the stories with Tyroc in them, he actually comes across as an interesting, likable guy. There's something about his personality that works. (I'm sure that the art helps.) It wouldn't be hard to fix him at all: put him in a decent costume, hammer his powers into something that works in the comic-book medium and doesn't make him omnipotent, mop out some of the racial-separatist junk he was originally saddled with, and you're all set. You don't even have to change his name: as unfortunate as it was, it's not as bad as "Matter-Eater Lad". After all, this is a guy who has reached heights only attained by a couple of other Legionnaires: