The replacement for Octo, Duo (Two) acts as a contrast to Novem. Duo is the most physically strong of the Gilgamesh in both forms, which is reflected in the size and shape of his God Beast form. It is remarked that Duo is harsh, angry and cruel and when fighting the Blattaria, uses his strength more than his Dynamis. Duo is recognizable by his hazel, almost gold eyes and white hair which sticks up wildly.

(Source: Wikipedia)