Dr. Diminutive

 is an evil scientist and a member of the League Of Villainous Evildoers Maniacally United For Frightening Investments in Naughtiness or also known as L.O.V.E.M.U.F.F.I.N.

He has lost all hair except around the temples. He also wears glasses. He appears to be named for his short stature. He is the shortest member of "L.O.V.E.M.U.F.F.I.N.".

History
He was first seen at the press meeting of L.O.V.E.M.U.F.F.I.N., where he pointed out to Dr. Doofenshmirtz that there was no press. The group then went to a local dance competition, which was where the press was. He was soon kicked out for bad dancing and crushed by falling debris from Agent P. He was disqualified from the L.O.V.E.M.U.F.F.I.N Pageant of Evil because of his height.

Background Information

 * Also he implies at the L.O.V.E.M.U.F.F.I.N. Pageant of Evil that he has a Napoleon Complex when he says "I don't have a Napoleon complex, Napoleon had a me complex!" ("Bullseye!")
 * He appears to make -erators instead of -inators or -inizers ("Agent Doof")

Appearances

 * "Nerdy Dancin'"
 * "Robot Rodeo"
 * "Bullseye!"
 * "Agent Doof"