An executive of Bonten and the younger brother of the charismatic Roppongi siblings. His specialty is Jiu-Jitsu. He has an older sister who is one year his senior. He generally follows his sister's lead and is a confirmed sis-con. Even though he grumbles and complains, he ends up granting any request she makes and cannot refuse her. While he seems to be dragged around by her, he can also be quite sly at times. He has purple hair grown to about medium length with dark purple highlights. His eyes are also purple. He loves parties and DJing, so he frequently visits clubs.

The leader and number one of Bonten. He is primarily called by his nickname, Mikey, rather than his name, Manjiro. He has short, neatly trimmed snow-white hair and hollow, black eyes devoid of light. He has a lethargic personality and is a man of few words. He enjoys red bean desserts like taiyaki.

The number two of Bonten, who primarily uses a katana. He has cherry blossom-colored hair and emerald eyes. With his thick, long eyelashes, he has a pretty face, though his personality is anything but. He has diamond-shaped scars on both sides of his mouth, which resulted from a certain incident. His speech and behavior are unrefined and coarse. He uses profanity without hesitation and refers to killing with the slang term 'scrap.' He is a germaphobe and a drug user. He is loyal to the leader, Mikey. He frequently bickers with Rindou and Ran.

The number three of Bonten. He has black hair and a scar running across his forehead and right eye. The scar is from a childhood accident in which he also lost his parents. Although he may seem indifferent and stiff, he is actually warm and kind-hearted. He is simply unskilled at expressing it outwardly.

The one responsible for managing the finances and circulating the money for the entire Bonten organization. He is often called Koko for short. He has long white hair and long, slanted eyes. He wears an earring only in his left ear. He pulls all-nighters as if it were a daily routine because he handles all the paperwork that Sanzu and the Haitani siblings refuse to do. It seems Kakucho and Mikey are the only ones in Bonten who recognize his hard work.