Avatar: The Last Airbender: The PromiseBryan Kanietzko, Michael Dante DiMartinoAvatar: The Last Airbender Comics, book 1

Characters in Avatar: The Last Airbender: The Promise

3 characters, main characters first.

Main characters

Aang
Also in Avatar, Avatar: The Last Airbender - Team Avatar Tales, Avatar: The Last Airbender - The Search Part 1, Avatar: The Last Airbender - The Rift, Part 1

Supporting characters

Zuko
Also in Avatar: The Last Airbender - Team Avatar Tales, Avatar: The Last Airbender - The Search Part 1
Kuei