Who is the demon who saved Cell from being killed from Vegeta? In chapter #4 of the Super Dragon Ball Heroes manga a demon with a hammer appears and saves Cell from being killed by Vegeta. Who is this demon?
The character you're referring to is Gravy, one of the strongest wizards during the foundation of the dark realm. He was a wizard in the Heavenly Realm. He basically joins Demigara and Putine to Fight against Chronoa(The Supreme Kai of time).