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Janemba
Janemba is the main antagonist in Dragon Ball Z: Fusion Reborn, and he appears in several other Dragon Ball media. He is a powerful demon and the living definition of evil. He dons a powerful demonic sword as his weapon.
He is capable of using his power to alter the reality to his liking, with no regard for how it affects others, showing an obsessive need to control. The evil energy which eventually manifested into Janemba had been gathering for generations and created a powerful evil heart.