Kouyou Hibiki is a character exclusive to the Yu-Gi-Oh! GX manga.
Kouyou was once a three-time Duel Monsters champion who met Jaden in hospital. He taught Jaden everything he knew about dueling and to always have fun dueling no matter what. He challenged Jaden to a duel and defeated him, and when he did he gave him his deck (Kouyou played an "Elemental Hero" deck which contained Winged Kuriboh) and his lucky red jacket. For further elaboration on this, see the spoiler.
Vova
