Evil is the main antagonist of Densestu no Stafy 3 and Ogura's 'personage'. He told Ogura about Pufftop long ago and sent him to conquer it. When Ogura returned to Evil, he gave Ogura one more chance and enhanced his form.
He is fought at the end of the game. In order to truly defeat him, Starfy must collect all 42 Evil Crystals. Despite having one short, Starfy and his friends confront him anyway. He is finally defeated when Ogura appears with the last Evil Crystal and sacrifices himself to destroy him.