Characters in One Piece, Vol. 100: Color of the Supreme King

Monkey D. Luffy

Captain of the Straw Hat Pirates, who unleashes Advanced Conqueror's Haki against Kaido during the Onigashima raid.

Also in One Piece, Vol. 1: Romance Dawn, One Piece Vol 2: Buggy The Clown, One Piece Vol 3: Don't Get Fooled Again, One Piece, Vol. 61, One Piece, Vol. 101: The Stars Take the Stage, One Piece, Vol. 105: Luffy's Dream, One Piece, Vol. 106: A Genius's Dream, One Piece, Vol. 107: Egghead Part 2, One Piece, Vol. 108: Better Off Dead In This World, One Piece, Vol. 109

Kaido

One of the Four Emperors and ruler of Onigashima, confronted by the Straw Hat alliance.

Also in One Piece, Vol. 101: The Stars Take the Stage

Big Mom

One of the Four Emperors, allied with Kaido against the raiding pirate alliance.

Trafalgar Law

Captain of the Heart Pirates, allied with Luffy and Kid against the Beast Pirates during the raid.

Eustass Kid

Captain of the Kid Pirates, allied with Luffy and Law against Kaido and Big Mom.