Future Diary: Grand Battle is a fanmade expansion to the Future Diary series.
Azami Kirisaki: The Main Protagonist of The New Series, She Enters the New Single Elimination Survival Game at the New Collsseum of Time, She is the 13th Diary User who Have a Little Sister named Kasumi Kirisaki whom she dearly loves.
Unnamed 14th Diary User: An New Friend of Azami's, He's a 17 Years Old From America, He Uses a Genre Diary.
Unnamed Other Diary Users: her Fellow Opponents of the Tournament.
Unnamed 16th Diary Tournament's Masterminds: The Twin-16th Diary Users and the Main Antagonist of the Series.
Muru Muru: is the servant of Deus Ex Machina and serves as a judge along with him in his New Tournament
Kasumi Kirisaki: Azami's Baby Sister who She's Loved.
Ai Mikami: Marco's Wife and the Tournament's Preliminaries Round Host.
Marco Ikusaba: Ai's Husband and the Tournament's Round 1 Host.
Akise Aru: The Tournament's Round 2 and Round of 32 Host, He's Kasumi's Crush.
Minene Uryu: The Tournament's Round of 16 and the Finals Host.