Janemba

Janemba, is one of the antagonists from the Dragon Ball game series. He is a demon was created as a result of the Soul Cleansing Machine exploding, causing the the evil souls to manifest into a yellow giant known as Janempa with a childlike behavior inside the Saike Demon. Janempa later transforms into a smaller form named Janemba that manages to overpower both Super Saiyan 3 Goku and later on Super Saiyan 2 Vegeta, forcing the two Saiyans fuse into Gogeta with the Fusion Dance. Gogeta then proceeds to turn the tables on Janemba and wipes the demon out with his Stardust Breaker attack, bringing back the Saike Demon.