Shiryu of the Rain is one of the Ten Titanic Captains of the Blackbeard Pirates, as the captain of the Second Ship.

He was originally introduced as the ex-Head Jailer of Impel Down, who had himself been imprisoned on Level 6 death row for his excessive, murderous violence against prisoners.[1] When temporarily released to help Magellan quell the prison riot caused by Monkey D. Luffy and Marshall D. Teach coming to Impel Down, he chose to go against what he was ordered and instead assist the Blackbeard Pirates, ultimately deciding to join them.

Due to his actions and role, he is a supporting antagonist in the Impel Down and Marineford Arcs, a minor antagonist in the Egghead Arc, and a major antagonist in the Final Saga.