Tengen is an experiment at a secret facility that works on human experiments and hybrids, Tengen was kidnapped by some scientists on his way home from work one day, he's extremely rebellious and stubborn most of the times hence often leading him to get punished really harshly although he never seemed to bothered by this and would continue to be his rebellious-self, Tengen is physically strong hence making him a favorite of the doctors as they usually use him to run tests