Reginald Kastle

Ryoga Kamishiro, nicknamed Shark, is a character in Yu-Gi-Oh! ZEXAL and is Yuma Tsukumo's rival.

Design
Ryoga has dark blue eyes, pale skin and dark purple hair, similar to the shape of tentacles hanging down befitting his deck theme of Fish-Type cards. His other accessories include a spiked pendant similar to the one Yuma Tsukumo wears, aswell as another pendant hanging down by a chain. He also features a red, spiked D-Gazer. His attire includes a dark blue jacket over a black shirt. When in his school attire, he wears a white shirt with a blue-lined collar.

Personality
Ryoga's personality is similar to that of Chazz Princeton's whilst he was an elite Obelisk Blue as he believes he is the most powerful and bullies anyone who's dueling skills are weaker than his own, even taking their decks after they lose. When Numbers possessed him, he became quite psychotic and caused destruction with his No. 17 Revise Dragon in the process.

Anime biography
Ryoga challenged Yuma Tsukumo to a Duel. When the mysterious entity Astral appeared before them a new legend began.

Manga biography
In the school that Ryoga and Yuma Tsukumo attend, Ryoga is known to be a bully, taking the Decks of his opponents when he beats them. Ryoga defeated Tetsuo and took his Deck. This caused Tetsuo's friend, Yuma to offer his pendant in exchange for the Deck back. Ryoga responded by breaking the pendant in half, so Yuma offered to Duel Ryoga himself, with his own Deck on the line.

Decks
Ryoga's Deck consists of various carnivorous fish such as sharks. With this Deck he is easily able to Summon his ace monster, the Exceed Monster, "Aero Shark". He also uses various WATER Support Cards such as "Aqua Jet" to strengthen his Monster Cards and make them tough to beat. When Ryoga was possessed, he had the Exceed Monster, "No. 17 Revise Dragon" in his Deck when he was Dueling Yuma.