Dr Diminiutive is an evil scientist and a member of the League Of Villainous Evildoers Maniacally United For Frightening Investments in Naughtiness or 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 was first seen at the press meeting of L.O.V.E.M.U.F.F.I.N., where he pointed out to Heinz Doofenshmirtz that there was no press. The group went to a local dance competition, where the press was. He was soon kicked out for bad dancing and crushed by falling debris from Perry the Platypus.