Rebbi is a Nimbi that wears a red robe. He also has zig-zag hair and a mustache.
Rebbi play a rather important role during Chapter 7-4 during the Skellobit invasion of The Overthere. He asks Mario and the heroes to help him fend of the Skellobits. Once they do, Rebbi gives them the Red Orb which is needed to build a bridge to King Grambi's castle. Rebbi also assists the heroes in fending off the horde of Skellobits who were trying to stop them from accessing the castle.