Koh

Koh (コウ) is a rising Tamer in the Light Fang organization, and is Sayo's main rival; by the end of her story, he has attained the rank of Platinum Tamer. His design is the male version of the protagonist from Dawn. He is partnered with, , , and his NaviDigimon , although he also acts as a stand-in Tamer for , , Gallantmon Crimson Mode, and Hououmon in two tournaments. Koh's name is likely derived from "kou" (光).

Digimon World Dusk
Sayo faces Koh during the Normal Tamer Tournament, the "Light Fang Assault" quest, and the Legendary Tamer Tournament. However, he is the only Light Fang Tamer to not fall under the ChronoCore's control, and soon after "Light Fang Assault" he escapes Sunshine CITY and allies with Night Claw to save his team, even battling Kowloon Co. with them. They use his Digivice to create an access portal to Sunshine CITY, and he even lends Sayo his Digivice to help her pass through.

Digimon Story: Super Xros Wars Red and Blue
Koh is fought in the Silver Tamer Match and leads Team Sunburst (サンバースト).