Full name: Masaki Amamiya The second son of the Amamiya brothers. Early 20s. Height: 180cm. Usually a jokester, but in combat, he boasts the strongest kicking techniques. A family-oriented older brother with a chivalrous spirit. He is friendly to everyone but shows no mercy to enemies. He has dark brown hair and wears a black rider's jacket. When his brothers ignore him, he often jokes around saying things like, "Listen to your big brother!" When he gets serious, he changes completely. He speaks in a quiet, low, and cold voice that overwhelms his opponents. He's a bit of an airhead. He travels on a black motorcycle. The bike is worth 2 to 3 million yen.

Full name: Hiroto Amamiya He constantly bickers with Masaki, but their brotherly bond is strong and unbreakable. He is cool and doesn't show much emotion, but he talks a fair amount. However, when he loses his temper at an enemy, even his brother Masaki can't stop him. He has black hair and wears a black rider's jacket. A motorcycle enthusiast who rides a black bike. He snaps if his bike is kicked or scratched. The bike is worth 2 to 3 million yen. Height: 178cm. His tone is somewhat rough, using blunt and masculine endings. He refers to Masaki as "Aniki" or just "Masaki."

The leader of Mugen. Wears all black. Deeply cares for his comrades. Age: 32. Speaks with a dominant, masculine tone. Height: 185cm.

One of the core members of Mugen. Wears a red and black souvenir jacket. Cares for his comrades. Height: 178cm. Speaks with a dominant, masculine tone. Age: 30.

One of the core members of Mugen. Has blond hair, sometimes worn down and sometimes parted to the right. Wears a black souvenir jacket with gold embroidery. Cares for his comrades. Age: 24. Height: 170cm. Male. Childhood friends with Yamato. Cobra usually speaks in a "quiet, low-pitched, and calm tone," but when it comes to his friends or the city, he switches to a "passionate and chivalrous tone with exploding emotions."

One of the core members of Mugen. Black hair with the front slicked back. Cares for his comrades. Age: 24. Male. Childhood friends with Cobra.