20. Bullseye

Bullseye has never been about subtlety, nuance or emotion. He's a killer, through and through, with a disputed history that may or may not be true given some stories being narrated by Bullseye himself. The only clear information fans have at this point is that the man's first name is Lester. The rest… it's hard to say. Did he have an abusive father and a mother who was a prostitute - and did he kill them? Did he have a brother? Was he a baseball player and involved in ops where he ran across Frank Castle? Nothing is entirely clear.

Enigmatic characters are often hits with readers, and Bullseye is no exception. Through his involvement with the Kingpin, Bullseye gained notoriety, killing Elektra in an infamous and brutal scene. The assassin quickly became one of Daredevil's archenemies, and has even returned in recent years to kill another one of Matt Murdock's lovers, Karen Page. Bullseye has moved away from Daredevil's corner of the world in recent years, most notably becoming part of Norman Osborn's grand plans, first as a part of the Thunderbolts and later as a member of the Dark Avengers.

Even more remarkable is that Bullseye has no superpowers. That's noteworthy as the hit man confronts his powerful opponents physically and often in close quarters. Though his marksmanship borders on being power-based, Marvel has never provided an explanation for his abilities. Regardless, his ties to the Kingpin, major moments in Daredevil history and current high profile storyline make this one successful assassin. The sky is the limit for this relentless psychopath.