Gree'gar is a powerful Tsutsaroth demon from Infernus. There, he rules the city Dis in Zamorak's name. Due to the disappearance of K'ril Tsutsaroth during the Battle for the Godsword in the late Third Age, Gree'gar has started calling himself Gree'gar Tsutsaroth, even though the honour to use the tribe name as title is reserved for only the most powerful demons.
He is only spoken of in the Trivium Daemonum, in which Relenor claims to have learnt of his existence from Azacorax, the Byzroth demon imprisoned within the Wizards' Tower. Relenor notes, however, that, as the information he obtained is taken from demons, it may not be wholly reliable.