Janemba

Janemba (ジャネンバ) is the main antagonist of the Dragon Ball Z movie Fusion Reborn, and he appears in several other Dragon Ball media. He is a demon of pure evil and great power. Janemba's origins lie in the carelessness of Saike Oni, the ogre responsible for watching the Soul Cleansing Machine, which exploded and released evil energy that possessed Saike Oni and mutated him into a large yellow monster. He is initially childlike and naive, but possesses incredible power. He later transforms into a smaller but much more powerful Super Janemba, who has increased battle power and reality-warping abilities, including opening dimensional portals and molecular manipulation. In battles against Goku and Vegeta, Janemba demonstrates immense destructive power and overwhelming presence, eventually being defeated by the fused Gogeta.