[@Neo Is Delight]

Alright, I can concede that Glitter is a less dangerous ability, though I don't think it's less versatile.

For more details, it's pretty simple. Injuries, of any sort, can be transferred. That's it. The affects of his cancer can be transferred, though he doesn't transfer the disease itself. I still wouldn't call it op by any stretch. A bullet tot he dead, and he's done. He cuts himself too deeply, moves to slow? Dead. And, like I mentioned, it's pretty niche. He's not much use outside of a fight, and his personality prevents him from wanting to hurt anyone. He's more likely to be taking the injuries of more useful heroes onto himself, to keep them on their feet. He doesn't like pain much, either, which gives him a certain amount of unwillingness to, as you said "cut his own throat".