Shigure

Mokuren Shigure was a major antagonist in the manga/anime series, Demon Kings. He was a member of Team Enishi, and a fierce rival of Toshin Enishi. Shigure is something of a "mutant", being created through experiments by humans splicing genes from Demon apparition, and Human DNA. As a result, he was created and designed as a weapon of destruction, bent on proving himself as the world's strongest fighter. Shigure's travels of mass murder and an ever-growing body count eventually led him to Enishi, who he was utterly humiliated by. Swearing to one day kill Enishi, or die trying, Shigure remained close to him so that he could one day get his rematch. Shigure swore to never lose to anyone before facing Enishi once again, or else he'd take his own life. Shigure also had an intense rivalry with Jun, who he desired to kill as well.

Personality
Shigure's defining trait, as stated by Enishi, is that he is completely stoic and is void of all emotions. Shigure's creation is the reason behind his initial lack of emotion beyond determination, hatred, and disgust. Shigure is an extremely confident individual, who takes great pride in his abilities. He was designed to fight to the top. Shigure's non nonsense attitude and calm demeanor usually makes him out to be the most composed of Enishi's group of friends. Of all of the members of Team Enishi, Shigure is shown to have a closer relationship towards Jun, who he develops a level of respect for due to the challenge of a fight that Jun is able to consistently bring to him, and Enishi who he develops a level of respect and tolerance for due to Enishi's power and how Enishi actively helps Shigure in his goal to kill him. Enishi is the only person Shigure actually regards as a friend, due to only having respect for the other members of the team. Shigure's goal to kill Enishi has developed into eternal respect, and he is grateful that Enishi is giving him another chance to fight him. For this reason, Shigure had sweared an oath to take his own life if he cannot defeat anyone before fighting Enishi once more.