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Sabo is the Revolutionary Army’s chief of staff who ranks directly under Monkey D. Dragon in the popular anime series, One Piece. Sabo is the sworn brother of Monkey D. Luffy and Portgas D. Ace. After learning of his brother’s death, Sabo rushes to the Corrida Colosseum and joins the tournament where the Mera Mera fruit was the champion’s reward.

One Piece
One Piece is a Japanese manga series written and illustrated by Eiichiro Oda. It has been serialized in Shueisha's shōnen manga magazine Weekly Shōnen Jump since July 1997, with its individual chapters compiled into 107 tankōbon volumes as of November 2023. The story follows the adventures of Monkey D. Luffy and his crew, the Straw Hat Pirates, where he explores the Grand Line in search of the mythical treasure known as the "One Piece" in order to become the next King of the Pirates. (from Wikipedia)

"Flame Emperor" Sabo is the Revolutionary Army's chief of staff, recognized as the No. 2 of the entire organization and outranked only by Supreme Commander Monkey D. Dragon. He is also the sworn brother of the notorious pirates Monkey D. Luffy and Portgas D. Ace. (from onepiece fandom)