Dr. Diminutive is a character from Phineas and Ferb and is a reoccurring antagonist in Knights of the Multiverse Season 1. He is a member of the evil organization L.O.V.E.M.U.F.F.I.N., where he acts as The Starscream of the group, always trying to rise to the top of the food chain and take over the organization for himself.
Diminutive has a Napoleon complex in the highest sense. He's often overly-aggressive, always has to make his voice the loudest in the room, and believes he deserves to be the most powerful evil scientist in the world. He's always seeking control of the most powerful gadget or easiest path to in all of the "experiments" he takes part in, often to the other scientists' expense.