The Main Character is Fudou, Yuusei. He is a D-Wheel operating Duel Rider, who commands a Red D-Wheel, and is a rare kind of Duelist. He is known for his genius style dueling, his considerable duel skill, and his cool and clever personality.
He is aided by Rua and Ruka, a pair of twins, who make fun of fate. They adore Yuusei, and have been in many tough battles. Rua is lively and blundering, while following his calm and collected sister, Ruka.
The main female is Izayoi, Aki, a girl with the "Super Ability", a power that can only be used through anguish and sadness. However, meeting Yuusei changes things...
Yuusei's rival is "Jack Atlas", who controls the "King", and is known as the "Absolute King of the Riding Duel". He fears Yuusei's Genius-like dueling, which has crushed every battle opponent in his path.