Bason is the ghost of an ancient Chinese wujiang (a military class of ancient China) that served for the Tao family. According to both Shaman King data books, which were released only in Japan, information such as his date of birth and blood type are unknown. He carries a kwan dao (a weapon similar to a halberd but with one curved edge and one straight edge following the line of the handle). He is sworn to serve Tao Ren, and he will do so as much as he can to serve him. In his days as an ancient Chinese warrior, Bason rode into battle on a horse named Hei-Tao. The spirit of Hei-Tao can be integrated into another horse kept by Ren, named Bái-Feng, to perform the Perfect Re-enactment of the Vorpal Dance. He is capable of adding tremendous strength and speed to Ren's kwan dao, and even making it quite larger, but also uses his body in attacks such as the Golden Punch. In Giant Spirit Form, Bason appears as a gigantic robot capable of launching fireballs.