Source: marvelcomicsfanon.com

6. Mysterio

Mysterio is the best. Like, if I was just weighting this list based purely upon which characters I liked most, Mysterio would be firmly in the Number 1 spot.

Quentin Beck was a special effects technician and stuntman who couldn't manage to break out as an actor.  He used his prowess with effects to become the super villain Mysterio, the best Marvel villain ever. I mean, look at that costume!!! That fishbowl!!! The eye clasps!!!!! The gloves!!!!! DAT FISHBOWL!!!!!!!!!

Mysterio once used his own cancer as a distraction to kick Spider-Man in the balls. That is a villain. Dude shotgunned himself in the head, stranded himself in an alternate universe, and still came back from both. Mysterio is such a charming dude and lovable loser that its impossible not to like him.

Guy once saved Iron Man and the rest of the Avengers. Seriously, Ends of the Earth: Check it out. Worth a read, for sure.