Grerimo is one of Dartz's henchmen in Season 4 of the Yu-Gi-Oh anime, Waking the Dragons. He appears to be a more lesser henchman than Alister, Valon, and Rafael. He took Yugi's god card, Obelisk the Tormentor, and dueled Yugi over it after defeating Weevil Underwood and Rex Raptor and taking their souls. Grerimo lost the duel to Yugi, and his soul was taken by the Orichalcos. The souls of Weevil and Rex were released.
He was never seen following this, but his soul was released when Dartz and the Great Leviathan were defeated. What becomes of him after this is unknown.