Knightmare Knight is one of the 14 Shadow Riders. He is the last Rider the Key-Keepers fight before Kagemaru. He duels with a DARK Deck with his winning card being Dark Armed Dragon.
Kightmare Knight is descriped as a tall young man wearing mostly black to cover him up. He wears a black mask that covers his face but leaves his mouth visible and carries a black Academy-issused Duel Disk.
He is the last of the Shadow Riders and the strongest just after Kagemaru.