Souichi Tomoe is an adult man who is about 35 years old, and has white hair and gray eyes. He also wears large round glasses and on his right eye/lens, he has the mark of Germatoid. Throughout the entire series until the Death Busters's defeat, he is always seen wearing the same outfit: a long-sleeved light blue shirt with thin black stripes, a blue necktie, blue pants held up by a black belt, black shoes, and a white labcoat.