Ankoku grew up in around the presence of Team Vile. He was kidnapped when he was a cub and forced to be the experiment of team Vile’s new serum. A serum that would age him into an adult while his mental state was that of a teenage adult. His given name was “The ominous Shadow” because of his shadow pigmentation.  Despite his past, her can be nice to those who are kind and caring but can instantly change into a cruel and sadistic against those like Team Vile who are cruel and evil.