Suboshi (角宿?) is a Seiryū Celestial Warrior and the younger twin brother of Amiboshi. The true name is Shunkaku Bu (武 俊角, Bu Shunkaku?), born under the star Horn (角). As a Celestial Warrior, he is able to use a secret weapon known as the Ryūseisui, a double meteor bell, and control it with his will alone. He and his brother are also able to communicate with one another by writing messages on their bodies.

In terms of temperament, Suboshi is fierce, impulsive, and stubborn to a fault, unwilling to listen to reason once he becomes determined to do something. He and his brother are extremely close as a result of their losing their parents at a young age and having a tough childhood. Suboshi is particularly devoted to his brother and will not hesitate to kill if it means protecting Amiboshi, even killing fellow Seiryū warrior Tomo without a second thought for this reason alone.[3]

(Source: Wikipedia)