Characters of Mirai of the Future.
Main
Kun Oota
Voiced by: Moka Kamishiraishi, Tasuku Hatanaka (future) (Japanese); Jaden Waldman, Evan Smith (future) (English)
The 4 year old main protagonist.
- Aloof Big Brother: His future self.
- Attention Whore: He becomes this after his sister's birth as he had all the attention beforehand.
- Big Brother Instinct: He lacks it at first but when faced with the prospect of both himself and his infant sister ending up on the Lonely Train....
- Big Brother Mentor: He tries to be one to Mirai but he goes overboard as he's overexcited but inadvertently becomes one when Mirai learns to follow his example of screaming with Joy and smiling.
- Bratty Half-Pint: Understandable, given his age.
- Break the Cutie: Usually after a shouting match with his mother although at one point, he breaks down after Future Mirai scolds him, he even goes as far as to declare he's not cute and runs away from her.
- Can't Get Away with Nuthin': His mother threatens not to buy him any more toys when he refuses to clear up, he learns why the hard way in his subsequent encounter with her child self.
- Character Development: He learns many valuable lessons over the course of the movie through his encounters, all which help him to realise his role in his family and to appreciate them.
- Cheerful Child: When he's happy at least.
- Deadpan Snarker: His future self is shown to be a quite jaded teenager.
- Hair-Trigger Temper: Seeing how he still gets annoyed easily as a young man.
- Heel Realization: His Heroic BSoD causes him to realize why his family needs him.
- Heroic BSoD: Briefly goes through one when he's trying to avoid boarding the Lonely Train, he snaps out of it when he sees Baby Mirai about to be pulled onto said train.
- Infant Sibling Jealousy: Much of the film's conflict is driven by his jealousy over his new baby sister.
- It's All About Me: Being only four years old, he naturally thinks the whole world revolves around him and will throw tantrums when he doesn't get his way. This is especially clear when his grandparents are trying to film his sister and he keeps demanding they film him instead.
- Momma's Boy: He's closer to his mother and has inherited many traits from her.
- My God, What Have I Done?: He becomes prone to such moments over the course of the film but the most significant of these is when he realizes why his family needs him when trying to evade the Lonely Train.
- Naughty Is Good: Takes after his mother in this respect but his encounter with her child self teaches him otherwise.
- The Cassandra: His future self; but he refuses to listen, especially after they hurl Confusing Multiple Negatives at each other.
- The Determinator: His encounter with his great-grandfather helps him gain the confidence required to continue learning to balance on his bicycle no matter how many times he falls down.
- This also spurs him to rescue his sister before she gets pulled onto the Lonely Train and declare he is her brother.
- Rail Enthusiast: Kun loves bullet trains. Working replicas are his favourite toys, and he initially wants to name Mirai after the Nozomi and Tsubame trains.
- "The Reason You Suck" Speech: Often does this to his parents and sister when he's having a tantrum.
- The Un-Favourite: Fears he's becoming this after Mirai's birth as he's no longer the centre of attention.
- This Is Gonna Suck: As the looks of increasing horror on his face emphasize when he's lost in Tokyo Train Station and has to face the potential consequences....
- You're Not My Mother: He does this while his mother's trying to restrain him during one of his tantrums.
Mirai Oota
Voiced by: Haru Kuroki, Kaede Hondo (baby) (Japanese), Victoria Grace (English)
Kun's infant sister who regularly appears as her teenage self from the future and the titular deuteragonist.
- Baby See, Baby Do: At the end of the movie, Mirai learns how to smile and shout with joy by watching Kun do both.
- Berserk Button: She has a birthmark on the palm of her right hand, her teenage self doesn't like Kun staring at it, though it helps him to recognise her.
- Her teenage self's usual reaction to whatever trouble Kun is in or has caused, leading to his encounters with her.
- Break the Cutie: Her teenage self unintentionally upsets Kun when she scolds him for trying to hit her again and for giving their mother a hard time.
- Cheerful Child: Shows the first signs of growing into one when she smiles at Kun.
- Daddy's Girl: Slowly becomes one as she warms to her father and he learns to hold her properly.
- Meaningful Name: Her name literally means "future".
- Straying Baby: Her infant self somehow follows Kun all the way to the Tokyo train station and nearly gets pulled onto the Lonely Train.
- "The Reason You Suck" Speech: Her teenage self scolds Kun every time he encounters her, not that he doesn't deserve it of course.
- What Have I Done: After her future self unintentionally upsets Kun while scolding him, she tries to reassure him that he's still cute, it doesn't work....
- What the Hell, Hero?: After Kun saves her infant self from the Lonely Train, her teenage self calls him out for running away and getting lost.
- When She Smiles: She doesn't smile as an infant until Kun splits his banana with her.
Mr. Oota
Voiced by: Gen Hoshino (Japanese), John Cho (English)
Kun and Mirai's father, an architect.
- Henpecked Husband: His wife has the more dominant personality. During one of her lectures, he actually cowers behind the table.
- House Husband: Since he recently started working from home, it's fallen on him to cook, clean and take care of the kids. He struggles but eventually becomes quite adept, to even his surprise.
- Not Now, Kiddo: His attitude towards Kun for most of the movie, a combination of being a Workaholic and having Baby Mirai to look after.
- He even forgets about putting the Girls' Day dolls away, ignoring Kun as a result.
- Skyward Scream: Downplayed but one of the memories Kun and Future Mirai visit is one of his child self screaming and crying after falling off his bicycle.
- Tears of Joy: His reaction to Kun successfully learning to ride his bicycle since he never managed to ride one himself.
- The Determinator: Not quite to the extent of his grandfather or Kun, but he spends much of the film learning to hold Baby Mirai properly.
- The Un-Favourite: Gets this from both his children for most of the first-half of the movie.
- Workaholic: He did nothing for Kun when he was an infant, as he and his wife both point out, and even Mirai takes her time warming up to him.
Mrs. Oota
Voiced by: Kumiko Aso (Japanese); Rebecca Hall, Madigan Kacmar (child) (English)
Kun and Mirai's mother.
- All There in the Manual: Some of the novel's dialogue implies that her name "Yumi"
- Big "WHAT?!": Her reaction to a pouting Kun calling her a hag/witch to her face.
- Can't Get Away with Nuthin': Kun's encounter with her child self lead to them making a complete mess of her home. She is forced to send him away before he too has to face the consequences.
- Cheerful Child: She certainly was, aside from her Naughty Is Good tendencies that inevitably got her into trouble. It's revealed in the light novel that this dimmed a bit in middle school when she became more self-conscious and was a victim of bullying.
- Control Freak: The light novel's prologue describes her as being a perfectionist and overthinking even compliments. She has some difficulty relinquishing the household duties to her husband out of concern that he'll mess things up.
- Foreshadowing: The stray cat that slashes at her child self, given the circumstances that would later put her off cats.
- Hair-Trigger Temper: Usually with her husband and/or son on the receiving end. She even admits it more often than not.
- Kind Hearted Cat Lover: She was as a child and wanted one for a pet, even receiving a stuffed one as a birthday present from her grandmother. She later went off cats after she saw one kill a baby bird.
- Like Mother, Like Daughter: Once she got married, that is...
- My God, What Have I Done?: Her child self when her mother arrives home and she and Kun realise the extent of the mess they've made.
- Downplayed whenever she berates Kun. Kun did need to get scolded but she wonders if she went overboard in the instances that he does.
- Naughty Is Good: Another one of her childhood traits as she willingly makes a mess of her home and encourages Kun to follow her example when he encounters her child self.
- Neat Freak: A trait she inherited from her own mother, but one that didn't really kick in until she got married. She still isn't very good at it.
- No Name Given: Subverted; While it's never mentioned by the family, the neighbours reveal the Mother's name is Yumi.
- So Proud of You: Her exact words when she hears about Kun's success with learning to ride his bicycle.
- "The Reason You Suck" Speech: Does this to her husband and/or son whenever she is stressed. The prologue implies she did this to her husband almost all the time until they adopted Yukko.
- Her child self when her mother sees the extent of the mess she and Kun have made, she was often subjected to this as a child.
- The Un-Favourite: Her younger brother Yoichi as she was convinced her mother loved her more when they were kids, though she was very much like Kun.
- This Is Gonna Suck: When her child self realises the trouble that awaits her for making a huge mess.
Yukko
Voiced by: Mitsuo Yoshihara (Japanese), Crispin Freeman (English)
The family dog, a miniature dachshund. Kun encounters him as a shaggy-looking prince.
- Animorphism: He appears to Kun as being part-human/part-dog (mostly the former) and has a detachable tail which Kun removes and then dons. He is forced to chase Kun all over the garden/courtyard and can only watch hopelessly as Kun runs around the house, acting like a dog.
- Attention Whore: Not as much as Kun but without whom, he'd be ignored altogether.
- Even the Dog Is Ashamed: He is appalled at Kun's antics and expresses as such through his human self.
- Perpetual Frowner: For most of his screen time.
- Silent Snarker: Unless there's conflict in the family to which he usually reacts by howling.
- "The Reason You Suck" Speech: More like a "Now you know how it feels!" speech which he directs at Kun since he had all the attention before Kun was born.
Grandmother
Voiced by: Yoshiko Miyazaki (Japanese), Eileen T'Kaye (English)
Kun and Mirai's maternal grandmother who occasionally looks after them.
- Like Mother, Like Daughter: Her daughter only really inherited her Neat Freak tendencies after getting married.
- Neat Freak: She often had to tidy up after her daughter and goes through the same thing with her grandson at the beginning.
-
One-Scene Wonder: Her husband, sort of, he only appears for the purpose of filming Mirai (and Kun) and discussing Great-grandfather.
Great-grandfather
Voiced by: Masaharu Fukuyama (Japanese), Daniel Dae Kim (English)
Kun's one-year-deceased great-grandfather whom he encounters as a young man.
- Mistaken Identity: His younger self resembles Kun's father, Kun even mistakes him as such at first.
- Skyward Scream: When he comes to while floating among the debris of what used to be his ship.
- The Determinator: He swam away from a shipwreck and ran a race with his future wife, both with a leg injury, he teaches Kun to be this by taking him for rides on horseback and his motorcycle.
Other
Older Boys
Voiced by: Various
A bunch of boys on bicycles whom Kun encounters at the local park.
- Big Brother Mentor: They offer to show Kun how to ride his bicycle without hesitation.
- Kids Are Cruel: Averted, they're all much older than Kun but actively try to help him and show concern for him when he starts crying.
- Nice Guy: A whole bunch of them, they could all have easily tormented Kun but they were genuinely concerned for him and wanted to help. They accept him almost right away once he's able to ride properly.
