Gantz is an inhabitant of the town of Bose.
He's usually found hanging out in the Bose Market, especially near the confectionary stand. He happens to have a crush on the girl operating the stand and shops at her stall several times a day.
Unfortunately for him, Katrina's already engaged to someone else and when her fiancé is released from the sky bandits' captivity, Gantz is most disheartened to learn that there was someone else all along.
Gantz has a unrequited crush on Katrina.