"Well, well... Speaking of who it is, if it isn't the Neko Majin knock-off, Usa Majin!"
Usagi Majin is a Neko Majin who appears in the titular manga, Nekomajin. He is the rival of Neko Majin Z. The first part of his name, "Usagi", means "rabbit," a reference to his rabbit-like appearance.
Usagi Majin comes to Neko Majin Z in search of his Majin-Dama (the Neko Majin's source of power). He proclaims that he stole all the other Neko Majins' Majin-Dama orbs across the world, making him one of the strongest. Usagi needs Neko Majin Z's Majin-Dama to truly become the strongest throughout the world. He then discovers Z's weakness, threatening to crush Z's Goku Action Figure. However, Z's best friend acts quickly and calls Majin Buu, who easily deals with Usagi Majin before the latter could swallow Z's Majin-Dama orb and saves Neko Majin Z's Action Figure.