One Piece: Ace's Story―The Manga, Vol. 1Boichi, Eiichiro Oda, Ryo Ishiyama, Sho HinataOne Piece: Episode A Manga, book 1

Characters in One Piece: Ace's Story―The Manga, Vol. 1

4 characters, main characters first.

Main characters

Portgas D. Ace
Also in One Piece: Ace's Story―The Manga, Vol. 2

Supporting characters

Monkey D. Luffy
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. 100: Color of the Supreme King, 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
Roronoa Zoro
Also in One Piece, Vol. 1: Romance Dawn, One Piece Vol 2: Buggy The Clown, One Piece, Vol. 61, One Piece, Vol. 101: The Stars Take the Stage, One Piece, Vol. 105: Luffy's Dream, One Piece, Vol. 107: Egghead Part 2

Minor characters

Boichi