Gussy Kenji

Gussy Kenji (グッシー健二, Gusshi Kenji) is a fictional character in the manga series of Shaman King. He is spirit of a dead boxer.

About
Gussy Kenji was a famous and talented boxer. He took in a delinquent student named Tatsushi and trained him, but after Gussy died in a car accident and his gym went out of business, he reformed back into a delinquent. Asakura Yoh fought Tatsushi by using his spirit, and after defeating him Tatsushi became good again.

Anime/Manga Differences
Gussy Kenji is a manga only Spirit, and does not appear in the anime.

Trivia

 * In Shaman King: Master of Spirits and Shaman King: Master of Spirits 2 you can fight with Gussy Kenji himself. His attack is rapid-punch.