Reginald Kastle

Ryoga Kamishiro, nicknamed Shark, is a character in Yu-Gi-Oh! ZEXAL.

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. In Yu-Gi-Oh! ZEXAL - Chapter 001, Ryoga defeats Tetsuo and takes his deck prompting Yuma to offer up his pendant for the deck, but Ryoga responds by breaking and throwing Yuma's pendant into a patch of grass near by. Before he could walk off, Yuma offered to duel Ryoga with his deck on the line.

Manga
Ryoga's manga deck consists of various carnivorous fish such as sharks. With this deck he is easily able to summon his ace monster, the Excess Monster, Aero Shark.