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Reginald Kastle
After hospitalizing his sister and getting him banned from tournaments, Reginald (Shark) Kastle swore to seek revenge on the man he saw as s responsible: Quattro. Reginald's rage was only exasperated when Shark Drake processed him. Fortunately, thanks to his bond Yuma, Astral, and Kite, he eventually overcome the control of the number card. Reginald cares deeply for his sister, Rio Kastle, but does not like to show it. His ace monster is Number 32: Shark Drake.