Wolverine healing factor. I mostly like it for the fact it's great for combat, but he's also practically immortal since his cells repair themselves and he doesn't age
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Yeah, plus you can perma die, which is bad, and good. Immortality would suck, no loved ones, bored easily after a while, depression at one point, and once the world/universe ends.... Well you still feel pain, and spaces vacuum won't feel to good