Ryoga Kamishiro, also known as "Shark", is one of the main protagonists in Yu-Gi-Oh! Zexal. He is one of Yuma Tsukumo's closest friends and rivals.
He wears a dark maroon colored top underneath his purple jacket and black jeans.
Shark has a strange phobia of onions.
After Shark lost the duel with Yuma, he joins a gang whose purpose is to steal the most powerful deck. Yuma and Shark work together in a tag team duel against Chills and Scorch.