His name is Redim. He is a Mutated Vakhi, who became Sentient. After the Visorak Invasion of Metru-Nui, he was mutated by Roodaka. He became taller, and stronger, as well as becoming Sentient. After a small bit where he felt grief for all he had done, he escaped into Ta-Metru where he found weapons. After this, he left Metru-Nui.
He eventually came across Axxon, who recruited him into the Order, where he acted as an Agent. After The Mata-Nui robot crashed into Bara Magna, he escaped onto the surface. He fought the Rahkshi, along with everyone else, and lived to see Spherus Magana reborn. His location is unknown.