Brawl

Brawl was created 99,450 years ago in order to drive the Vrai out of the Matoran Universe along with Blackout, Barricade, Starscream and Bonecrusher. After this was accomplished, Barricade, Brawl and Bonecrusher were placed in stasis pods. When Blackout created Darkmount, he took the pods with him, and later ordered Malygos to retrieve a crystal, hidden by the Great Beings on a distant planet, which would reawaken the Makuta. That happened. Then, Ynot, the Makuta Anima and The Fallen attacked. Brawl attacked Sasuken and Asumaru, and managed to melt some of the former's armour.

50,000 years later, Brawl randomly popped out of nowhere to kill King Agrippa's crew, and then disappeared again.