The Japanese manga and anime series Future Diary (未来日記, Mirai Nikki), written and illustrated by Sakae Esuno, features an extensive cast of characters.
Also known as Yuki (ユッキー, Yukkī), he is a reclusive and shy 14-year-old middle school student, opting to be a bystander to incidents around him to write about them in a diary on his cell phone instead.
He becomes involved as one of 12 contestants in a 90-day battle royale when, to his shock, his imaginary friend Deus turned out to be a real God of Space-Time, planning to have the sole survivor of the game succeed his throne.
Eventually he learns of Yuno's true origins and intentions, finally stepping out of his role as a constant bystander to intervene in changing her future, including those of the other Diary owners that led terrible, unfortunate lives.
While a perfect model student on the surface, she is actually a psychopathic yandere who is obsessed with Yukiteru Amano, whom she affectionately calls "Yuki", and kills unhesitatingly to protect him.
She fails to blow up the vault, but survives the blast, and revealed before they invade the twin tower buildings, Deus transferred his knowledge and half of his power to her, thus preventing her death.
Minene survives the final battle, and is shown to be living happily with the Third World Nishijima while having children who have inherited her godly powers and can fly, though she still stayed in contact with Deus and Murumuru.
Aru is the protagonist of Paradox, set in an alternate timeline after Murumuru accidentally kills Yuno and Yuki is mortally wounded by Takao Hiyama.
However, his attempt to stop Murumuru from erasing the timeline fails when he stumbles across Yuno and how she killed her Second World counterpart, before being cast back to the start of the survival game.
A composed and calm person, Keigo has no interest in the game and wants to find a way to stop it before more people get hurt, subsequently becoming Yuki's ally.
While offering Minene to the trio in exchange for help avoiding her own Dead End, they are attacked by Tsubaki's hypnotized cult under the Twelfth's control.
Keigo soon has the hospital surrounded and personally leads the SWAT police to kill Yuki, Yuno, Minene and save his family.
Later on, Murumuru revealed that she had warned Keigo about his son's condition to "speed things up", with Deus noting that Fourth was a good candidate to be the last man standing.
However, Reisuke claims he never loved his parents since they neglected him and wants to win the game to be a "Super Elite" to prove he does not need to depend on adults.
As a result of the future change made by Yuki in the alternate universe, Tsubaki and the cult no longer become what they were, this in turn prevents the death of his parents and they become a happy family.
However, Tsubaki betrays everyone, revealing she was using Minene as bait to lure them so she could trap and kill them and tells Yuki that she lied about not being interested in the game as she wants to win and end the world as she hates it.
The only thing keeping her sane was a handball given to her by her mother, which she eventually loses, causing her to become resentful and wish for the world to end as compensation for her suffering.
With her followers distracted by the ball and Tsubaki unable to close her scroll with one hand, Yuki throws a dart at her Future Diary.
Ai appeared early in the series working undercover as member of the Omekata cult with her friend Orin Miyashiro to spy on Tsubaki.
Yuki's friends cut the telephone line thinking they have disabled the couple's apprentice phone until they take out their future diaries.
He appears in the alternate universe, with his future changed as Hinata takes a closer dedication to the dogs, this unites them and he no longer neglects his family.
John Bacchus (ジョン バックス, Jon Bakkusu) – Balks in the English dub – is the Eleventh Diary user and final one to be introduced.
Despite his ideology, he is a gentleman, befriending Kamado and inviting her to help him in his place to give everyone in Sakurami City the power of the Future Diaries.
The only way to gain entry is through a retinal scanner which only he and the Gasai family can access, believing Yuno is unable to since Akise assumed she was an impersonator.
Deus ex Machina (デウス エクス マキナ, Deusu Ekusu Makina) is the God of Time and Space and the Diary Game overseer and creator.
Convinced by John Bacchus' partnership, Deus created the Diary Game to find a worthy successor to take over his place.
She poses as a major antagonist towards the end of both the main series and Future Diary: Paradox, scheming behind Deus for her own personal fun.
Ouji Kosaka (高坂 王子, Kōsaka Ōji) is a classmate of Yuki's who used to bully him in the past but later became his friend during the Diary Game.
Though dead throughout the majority of the storyline, she is shown in the past to have abused and locked Yuno in a cage, and vents her frustrations on her, claiming she is a bad daughter.
In the alternate universe, he is caught trying to insert a makeshift bomb within Tsubaki's parents' car, changing the future of the cult and Reisuke's family.