A student who transferred to the same school Kei Kurono attends. It is revealed he is a survivor of Gantz but wants to continue playing the game.
Before the beginning of the series, Izumi both participated in the Gantz hunts and Was able to win his freedom. From the information left behind on Nishi's website, Izumi was able to figure out that he was once a member of a gantz team. While Looking For Kei Kurono To Confirm His findings, He encountered A "Shorty alien" that had infiltrated the school to take Kei's Life. He attacked the alien and Forced it to Abandon it's disguse, But soon after he was overpowered. It was this incident that caused izumi to try and rejoin Gantz, and Led to the Massacre At Shinjuku square.
Izumi Is conceited and self centered, but will pretend to be kind and caring outside of Gantz. Like many of the experienced Gantz hunters, he cares little for anyone but himself and had no remorse for the killing of innocents During the Shinjuku incident. He views Gantz as an exciting game as opposed to sports, which he excels at. He also seems to have a superiority complex, viewing complete strangers as lesser human beings. It leads to him having quite the rivalry with Kurono for the title of best Gantz warrior, some have even called him Gantz Vegeta. Like Vegeta he has also shown compassion for his woman, suggesting he may have a good side under his murderous demeanor. Unlike Nishi nothing is known about his past.
Izumi likes to take Gantz targets head on with his Gantz katana most of the time, leaving everybody else to fend for themselves. His goal is to get the most points to prove he is the very best in Gantz. Outside of Gantz he resorts to his invisible cloaking field to fight, due to him being ambushed by gangs of vampires on the regular.