Janemba is one of the enemy characters in Dragon Ball series. He is a demon of pure evil and great power. Janemba is the living definition of evil.
Have you ever wondered why there were so many evil aliens attacking earth in Dragon Ball series ? No ? Well I do. There seems to always be powerful than the one that came before and all of them happens to meet Goku and the gang.
All the villains has the same characteristic too. Like many Dragon Ball villains, Janemba is a destructive and aggressive monster who seems to have little motivation other than sadistic pleasure and lust for anarchy.
In his first form, he appears more childlike and innocent, but becomes much less so in his second one.