Kazuo Kuwabara

First appearance in manga: Chapter 241 A veteran member of the Osaka team who has cleared the game three times before the Nuri mission. He has sex with "everything that has a wet hole" (quoted by Anzu) before he kills it. During the mission, the 100 point alien grabs him and tries to suffocate him, and in the process, knowing that he'll die, Kuwabara has sex with the alien before the inevitable (the alien is a shapeshifter, and his current shape was a demon made out of hundreds of nude women). And he takes drugs before the hunt like the other Osaka Team members. He was caught by Kato and was ran to safety, he is one of the only survivors of the Osaka Gantz team currently. After the mission he decided that he wants to leave Gantz. In a special chapter dedicated for Osaka team, it was shown that his occupation is an english teacher. Other's attitude towards him suggest that he only show his perveted side to few people, especially Gantz team. (Source: Gantz Wikia)