Plankton

The ten-foot atomic powered Plankton is a forever playable character in the Theory series. He is a large, loyal, and atomic-powered Plankton that enjoys adventure. In the original, he had the personality of a leader, which was dropped because Nicole took his old personality of a leader. He was kidnapped by Lauren Tiniathan along with Planktonine in World 1 in the sequel. He is also the only male playable character in the Theory games.