Bellicus

Bellicus is the voice of anger and aggression in Alien X. He appeared in the episode "X Equals Ben Plus 2" when Ben transformed into Alien X,Ben later found himself locked inside Alien X because of the eternal debates between the two entities who control its body,one is Sarena and another is him. He has reality warping powers like Serena and Alien X. He also states Ben is the voice of reason.