"Ravager"

Ravager is a powerful Dark Hunter who once lost all his memories. Ravager was first found on an unknown island wandering along the coastline and from there he was brought to the base where he suddenly escaped his handlers and destroyed roughly a third of the island. For some reason, he was never dismembered.

Apart from his enormous strength, Ravager also wields a sword and a shield. They have the power to become more powerful in order to match their foes and obstacle(s) with out. They seem to have a consciousness because they automatically increase their strength without command from Ravager and without any sorts of electronics or gadgets behind the mechanism. He is currently active, but his location is unknown.

Trivia

 * The Avohkii on Ravager is his face, and not the actual mask.