Source: comicvine.gamespot.com

6. The Sentry

(The Avengers, Marvel Comics)

You know, for a guy who very vocally hates The Sentry, I sure spend a lot of time writing about The Sentry.

The Sentry was originally marketed as a lost Stan Lee character who was finally added to the Marvel Universe. Of course, that was a lie. He was a new Paul Jenkins character. He’d ingested a serum that essentially turned him into Superman. Except, that was also a lie. Turns out that he was a mentally unstable drug addict who drank a serum and gained super powers, but at the cost of developing a dangerous new identity known as The Void.

The Sentry joined the Avengers, the Mighty Avengers, and eventually The Dark Avengers. Then he full-on lost it and ripped Ares in half. Thor beat him to death at the end of The Siege of Asgard, and he stayed dead for a while, until the Apocalypse Twins brought him back as a Horseman of Death, along with Daken, Banshee, and The Grim Reaper. But now, it seems he's alive and back to normal.

And it’s sad, because the bounty on his head, which was formerly held by Killthesentry.com, is apparently no longer in effect.