Kōzuji Kazumasa

Kōzuji Kazumasa was a prisoner at DW, and a former MMA fighter.

Personality
Kōzuji is shown as only thinking for himself and uses oppression to keep himself on top. He goes to the extent of using his followers as human shields despite their protests.

History
In the manga, there is nothing known about his history.

In the anime, however, Yō Takami said Kōzuji was a successful Taekwondo and a Mixed martial arts fighter. His nickname at that time was "The Ultimate Warrior". When he met an actress on a variety show and she wouldn't give him her e-mail, he lost his temper and attacked her. He was sentenced into Deadman Wonderland after that.

Prison arc
In the manga, Kazumasa was seen harassing another prisoner in the cafeteria and taking his CP. Ganta accidentally bumps into him and Kazumasa points his attention to Ganta. He punches Ganta and says that he rules over everyone else. He forces Ganta to laugh at the other prisoner and leaves after that.

This was altered in the anime. Kazumasa first appears in the locker room before the Dog Race. Again, he starts harassing people, but Yō stands up to him. Kazumasa kicks and breaks Yō's arm. Kazumasa tells everyone that he will win the race, or else. Ganta accepts, but suddenly Shiro appears and Kazumasa is about to punch her too. Ganta then throws a book at Kazumasa's face in order to protect Shiro and to stand up for himself. Kazumasa was about to attack Ganta when Makina stops them.

During the whole Dog Race, he tried hard to stay alive and cheat (he did the same in the manga but told others to kill Ganta). During the final round it was him, Ganta, and Shiro (in the manga it wasn't just them but other prisoners). He tried to intimidate Ganta, but ending up getting hit in the face with the ball by Ganta (he didn't do that in the manga). Then he fell off the platform and died (he survied in the manga). In the manga, he was approached by Makina knowing how he cheated and would have to serve a year in solitary detention.