[Obsidian]

Sweet. I knew there was a reason my OCD sticks me to even and multiple of 5 numbers.

Next question.... Good one.
Well, Deadpool would have died without his. But then again he's an anti-hero....
Ok, you have me on this one, lol.

I know a few who could die but not would die. Hrm...
Iron Man
Cyborg

Eh... let's go with Spiderman because had that spider not been a mutation, he probably would have died.

I can't think of anyone else. >->
3 guesses ok? X]