- 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 in the Dressrosa Arc.
- Chapter 789, the chapter of the same name.
- Sabo: Chief of Staff of the Revolutionary Army and Luffy's adopted older brother. He took on the alias after helping Luffy leave the Colosseum and fought in the final round under it.