The Mas comes from a samurai family that values tradition, so much that for suicide, he would rather use a kanata than a gun. Katana is a symbol of his hard earned freedom. The Mas spends most of his free time (although he does not have much free time for being a Tokyo salaryman) in his kimonos, serving green tea at Seiji's karate dojo.
Yoshi
Yoshi was born to a "shogun" family that governed the Kawasaki area back in the days. He is named after the dinasour from Super Mario World, and was devastated when Playstation took over Nintendo and even his own popularity. He fits the typical stereotype; short, yellow, and his camera. Yoshi carries his own Super Nintendo controller wherever he goes.
Seiji
Seiji, as a son of a sumo referee, fought his parents desires to raise him as one. Like the rest of the band, he is a master of martial arts and will use it on children when necessary. At 5"11, he said to be freakishly tall for an Asian and has trouble riding inside rice rocket cars.