Ant-Man

Hank Pym, is a genius, one of the founding members of the Avengers, the creator of Pym Particles and Ultron, a sufferer of Bipolar disorder and a modern-day superhero.  He has acted under many memorable, identities, such as Ant-Man, Giant Man, Goliath, Yellowjacket, and the Wasp.

 Scott Lang was the second man to take up the mantle of Ant-Man. He has been a member of both the Avengers and the Fantastic Four.