- Monkey D. Luffy: The main protagonist of the series, and captain of the Straw Hat Pirates. He first used the name to fight in C Block of the Colosseum's Mera Mera no Mi tournament.
- Chapter 789, the chapter of the same name.
- Sabo: A member of the Revolutionary Army and Luffy's older brother. He took on the alias after helping Luffy leave the Colosseum and fought in the final round under it.
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