Kyou Yahagi 矢作キョウ

Nicknamed the "Crusher" and a former member of Team Asteroid, Kyou is a cocky Vanguard player who mostly cares about himself, always hoping to surpass Ren and become the best player one day. He sometimes refers to himself in the third-person perspective as "The Great Kyou".

Kyou uses a Spike Brothers deck; his ace cards are Sky Diver, General Seifried, and Demonic Lord, Dudley Emperor in season 2.