Тэцуро Сэгава

Ши Фукамати's best friend, who attends the same school as him. Mizuki Segawa's older brother. Very intelligent and quick-thinking, a fan of science fiction (he was the president of the school's science fiction club). His interest in science fiction allows him to make plausible assumptions about Guyver, the Cronos organization, and the abilities of Zoanoids.