Source: theunspokendecade.com

4. Madcap

(Deadpool, Captain America, Marvel Comics)

Madcap spent a long time bopping around among F-List supervillains before his recent turn in Deadpool bumped him up.

Madcap (real name unknown), was a young man on a trip with his religious group when AIM accidentally wound up disposing of a newly created chemical right on top of their bus. The chemical, Chemical X07, killed everyone except Madcap, who was left with an intense healing factor.

The accident broke him psychologically and turned him into a madman. It also gave him a separate power: He could drive people temporarily insane. Armed with his own belief that the world was a chaotic place that had no meaning, and wearing a ridiculous costume, he took to the streets as a supervillain.

He spent a long time bouncing off the fists of every B, C and D-List hero in the Marvel Universe, including Daredevil, Power Pack, She-Hulk, and Nomad. Eventually, though, he found a place as Deadpool's newest archnemesis, and there he truly flourished.

Read More: List of Crazy Marvel Characters