Xoco was a male Ga-Matoran who lived in Metru Nui for 50,000 years as a Matoran. After all of his friends became Toa he was alone for a long time. He decided to create Toa armor because Xoco believed his time has passed from living as a Matoran. Yet he wants to stay as a Matoran to build armor, weapons, and learn to make mask from the Ta-Matoran because he knows that Toa are fighters and not builders. He must maintain a secret identy for himself because he knows that Dark Hunters would want to kill him when he is off guard in his Matoran form. As a Matoran he is Xoco. As a Toa, he is Xoxar. It is possible that Xoco knew Nidhiki, Lhikan, and Tuyet before they became Toa. Eventually he joined their team and fought many battles such as the great fight with the Kanohi Dragon.