Pretty much like it says in the title.
And this is concerning mainstream continuity, not “Elseworlds,” imaginary stories, one-shot alternate universes, or universes that no longer exist. (Like Earth-2)
So far, I’ve got…
The Punisher (d-freakin-uh)
Most of Marvel’s Ultimates (Which count, because they’re still being published)
But my brain has frozen up, so I can’t think of any more. (And I can’t think of any DC characters, oddly enough.)
So…who else am I missing, if anyone?
*Technically, I’m not sure he counts…most superheroes seem to be much less reluctant to kill undead creatures like Vampires, and artificial beings like robots—no matter how sentient they are. What the hell’s up with that? I mean, I can see killing zombies or mindless androids without much concern, but…A.I.s, like the Manhunter robots?