Characters in Yui Kamio Lets Loose.
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Main Characters
Yui Kamio
The eponymous heroine, she was once a delinquent wild girl before some monks sealed her personality and made her into an obedient girl.
In general
- Alternate Identity Amnesia: Each of her personalities seems to not know what the other experiences to a certain degree.
- Yui in White doesn't remember what Yui in Black does, yet Yui in Black was able to remember the promise Yui in White made with Kiito just a few moments before to keep his aspiration to be a veterinarian a secret.
- Yui in Black has no knowledge of what Yui in White has learned. Yui in White knows English but Yui in Black doesn't, and her education stops at the 5th grade, the same timeframe of when the chain of Sanzo was first put on her.
- In-Series Nickname: Her personalities are called "Yui in Black" and "Yui in White".
- Mental World: When White wills it for the first time, the two are able to communicate with each other on an imaginary beach.
- Secret-Keeper: Keeps Kiito's unmanly desire to be a vet a secret.
- Split Personality: When she was a kid, she forcibly gained another personality when the monks sealed away her delinquent behavior.
- Split-Personality Makeover: When sealed, her hair is white. When she is let loose, her hair as well as the clothing she wears and items like an umbrella, turns black.
- Split-Personality Switch Trigger: The chain of Sanzo not only ties her hair up, it is also a Magical Accessory that ties down the Yui in Black personality. Removing it swaps White to Black.
- Super-Strength: Yui in Black can send people flying with a simple kick and destroys a plush toy after punching it like an alarm clock. Yui in White is weaker, but she still outruns Kiito with ease.
- Weirdness Magnet: Because she's considered the strongest, for one reason or another all kind of weirdos start showing up at the Academy after hearing she might be there.
Yui in Black (Original personality)
- Berserk Button: Yui in Black turns into an executioner if anyone dares to bother Nao.
- The Berserker: Yui in Black tends to immediately fight anyone she doesn't like. After Kiito accidentally pushes Nao, she gets even angrier she's not letting her kill him. She's friendly with people when unprovoked.
- Chain Pain: She can use the loose chain of Sanzo as a binding weapon.
- The Gadfly: She often likes to romantically tease Kiito ever since he became a Secret-Keeper.
- Genki Girl: Yui in Black has a mental age of a 5th-grader and is easily excitable about things she doesn't know, on top of being hyperenergetic.
- Hidden Depths: Kiito quickly realizes that this fearsome delinquent actually cares a lot about animals and people around her.
- Red Baron: Yui in Black is known in delinquent circles as Juvenile Gang Destroyer and The Devil for her strength and violence. In the Academy she immediately gains the nickname Phantom as the students only know about Yui in White.
- Reused Character Design: Her overall appearance is quite reminiscent of Hagoromo Gitsune's human form.
- Wild Hair: She has an unattained hairstyle. Design wise, it helps to further distinguish her from the Yui in White persona.
Yui in White
- Academic Athlete: She is both smart and physically fit.
- Everyone Has Standards: A normally chipper Yui in White finds Goto Yaginuma's plan to get rid the school of Life Lovers so selfsih she transforms right in front of him.
- Even the Girls Want Her: Yui in White's angelic personality and looks attract everyone around even outside of Academy the Academy, boy and girl.
- Helpless Good Side: She is slightly weaker and more passive than the Yui in Black side.
- Identity Breakdown: When Yui in White thinks about Black being "the original", she asks if she's not the real one and should disappear.
- In-Series Nickname: In order to keep "Mai-Nyun" from learning that Yui in White is the same Yui Kamio she was looking for, Kiito gives Yui in White the name "Mio-Nyun" to obstruct her.
- Proper Lady: Yui in White has the elegance and intelligence of an honor student, and is also very self-conscious and hates bothering others.
Kiito Sonomiya
A rich kid who is part of the Life Lovers whose world turned upside down when he meets Yui Kamio.
- But for Me, It Was Tuesday: In Chapter 1 some girls who have been at Kiito's party try to get his attention. He not only can't bother to remember them, he had so many yacht parties he can't distinguish between them. He also dismisses vengeful punks despite actually never meeting them.
- The Casanova: Kiito was knows as the capturer of the hearts and regularly hosts yacht parties. Despite his toxic attitude, girls are still in love with him.
- Custom Uniform: He doesn't wear the uniform of Teiyo Private Academy and instead wears expensive clothes. He even has a gaming chair as his classroom chair.
- Determinator: He is very persistent when he puts his mind to it and can fend off girl bosses despite the injuries.
- Fiction 500: He hosts yacht parties regularly and boats he can rent the entire zoo with trucks of icecream. He also has purchased the one and only Jet Pack straight from London's exhibition just in case.
- Jerk with a Heart of Gold: Kiito starts as a typical rich boy with cold personality who has very low opinion on everyone, but is shown to be putting a tough facade and genially cares about animals and people close to him.
- Secret-Keeper: Learns of Yui Kamio's secret of having a split personality and unbeknownst to others helps her out with Nao.
- Stronger Than They Look: For a rich boy, Kiito knows self-defense and keeping Yui in check has built his stamina above the Academy's athletic standards.
- Unmanly Secret: Kiito thinks people don't care enough about animals and wants to be a pet, but it would greatly clash with his hot boy persona, and he asks Yui to not tell anyone.
- Urban Legend Love Life: Despite his reputation of being The Casanova, he never had a real date alone with a girl before.
- Wholesome Crossdresser: In Chapter 6 he uses Yui's wig to take info from Kana's Special Agents who are after her.
Nao "Ebi" Ebisuno
Yui's childhood friend and effectively get caretaker.
- Animal Motifs: "Ebi" means shrimp in Japanese and Kiito notes her pigtails resemble shrip sushi.
- Girlish Pigtails: Her hairstyle is in the shape of ebi nigiri.
- Instant Knots: Nao can tie Yui's hair up instantly and even a couple of people together as well. She calls it a family technique.
- Out of Focus: Nao has been pushed to the background as the series progresses and Kiito managed to handle Yui on his own.
- Secret-Keeper: She takes it upon herself to keep a secret that Yui in Black and Yui in White is the same person.
- Ungrateful Bastard: By all appearances, Yui in Black is the one that actually saved her as a child, but Nao wants nothing to do with her and tries to keep her sealed. Yui in Black considers her a friend and is clearly rather hurt by this.
Teiyo Private Academy
Life Lovers
A group of rich kids and Kiito's friends who live life in "easy mode" since kindergarten.
- Blind Without Them: Washimi can't see when his glasses are taken off.
- Childhood Friends: Life Lovers have been friends with Kiito since kindergarten.
- Clingy Jealous Girl: Kara has been around Kiito for a long time, so she naturally doesn't like Yui hanging out with him and tries to dig into their relationship.
- Custom Uniform: Like Kiito hey don't wear the uniform of Teiyo Private Academy, which Goto uses as an argument of the Academy getting corrupt.
- Evil Costume Switch: When Kara gets infected with Placental Rot Mushi, she wears a military-style uniform.
- Pest Controller: As a girl boss, Kara can control a swarm of poisonous bees and moths.
- Rich Kids: They are rich kids who are high on life and are more privileged than the rest of the Academy.
- Spoiled Brat: Kara Shozoin has an increased sense of self-importance due to her privileged status.
- Out of Focus: Usami and Min don't get to do anything at all in the series.
- Yandere: Possessed Kara not only wants to get rid of Yui Kamio, but also of every girl near Kiito and thinks him going against her is a trial.
Koyagi Yaginuma
- Black Magician Girl: Koyagi uses witchcraft to brew Yui's hair into cookies and feeding them to Kiito that make him see illusions.
- Didn't See That Coming: While trying to steal Kiito's First Kiss, Koyagi didn't expect him to be afraid of it and his playboy reputation to be fake.
- Gold Digger: They all want to marry into money and think highly of Life Lovers, but Koyagi is set on Kiito specifically.
- Instant Runes: Koyagi can conjure magic circles by touching the floor.
- Master of Illusion: Koyagi appears to Kiito as Yui in White after feeding him her hair and goes on a date with him.
- Ominous Opera Cape: Koyagi is an antagonist who walks around wearing a black cape.
Goto Yaginuma
The older brother of Koyagi and the student council president.
- Ambiguously Brown: Has a darker skin tone than his sister.
- Jerkass: Looks down on anyone who are not whom he sees as "noble" as "plebs".
- Entitled Bastard: He thinks he "raised" his sister to be a disposable pled and when Yui in Black assaults him, he asks Koyagi to help, while still promising to make her life hell and expell everyone else.
- Hates My Secret Identity: He hates "Lady in Black" for being a brute while keeping Yui in White in student council, without realzing they are one person.
- Momma's Boy: A look at this phone shows that he has only one contact, his mom. He has so high standards he doesn't even keep his security team in the contacts.
- Not-So-Well-Intentioned Extremist: He wants to purge the school from the unruly kids, but aside improving school's reputation, he wants to turn the school into an Egopolis for himself and Yui in White. It actually grosses the latter enough that she turns into Black willingly.
- Student Council President: He is the student council president of the Teiyo Private Academy and is very strict about the rules.
Mushi hosts / Girl bosses
Honoka Awadama
A girl boss from Wakayama Prefecture. The Corpse Mushi who possessed her has the power to control Japanese dolls and affect people in the same way the doll is damaged.
- Bitch in Sheep's Clothing: She reinterprets Yui's earlier fortune-telling to calm her down and appear trustworthy.
- Creepy Doll: She has a collection of Japanese dolls which the Mushi use like voodoo dolls to harm others.
- Defeat Means Friendship: With the Corpse Mushi getting exorcised, Honoka joins Kiito's large harem and even protects the school from Ayako.
- Eye Scream: Honoka's doll remotely cuts Mima's eye for insulting it, though it heals in a few days.
- Gaslighting: She keeps sending dolls against Yui in White, then recalls them and says she didn't see anything, making Yui believe she hallucinates under stress.
- I Know What You Fear: Her attack triggers when the opponent shows fear. With her army of Creepy Dolls and also a knife she keeps on her person, it works on most people.
- The Little Shop That Wasn't There Yesterday: Honoka's antique doll shop appears in the city where it wasn't before.
- New Transfer Student: Honoka transfers directly into Yui's class to get rid of her.
- Nightmare Face: When she fights directly, her face cracks and her hair turn black.
- Portal Door: She seemingly transforms one of the classrooms into her shrine along with the garden, but Kiito checking his phone shows they've been transported to Wakayama.
- Self-Harm: Just like her self-hurting dolls, Honoka has shown to have her arms Covered with Scars because she keep being enraged about Yui. Then she cuts herself in front empathic Yui in White so the damage transfers to her, intending to die together.
- Voodoo Doll: Honoka's dolls can inexplicably hurt their faces, with the damage getting shared by the person they are synced with if they express fear.
Ayako Kitsujo
A famous violin musician from Shizuoka. Her Mushi can kill people with music.
- Child Prodigy: She debuted as a musician at the age of 4, and her classical arrangements have been selling well while she's still in school.
- Eviler than Thou: After Heel–Face Turn Honoka tries to stop Ayako, but due to losing her Mushi and also being less trained in general, she receives a Curb-Stomp Battle.
- Hypocrite: Kiito calls her out regarding her Mercy Kill spree despite her not wanting to do the same for her comatose sister.
- Kick Chick: Even without a Mushi, she still has rock-crushing kicking techniques.
- Mass Hypnosis: Her music physically drains people and also charms them, turning the school crowd into a drooling zombie horde. If the spell isn't broken, everyone dies for real.
- Moral Myopia: Ayako believes she's cleansing Japan of the sick people and is fighting Mushi, by listening to a Mushi who makes her kill innocent people. She also swears vengence to Yui for making her sister comatose and not the Mushi she hosted, then tries to kill the entire Academy just to hit Yui.
- Musical Assassin: Her music hypnotizes and drains the life from people until they die. She has perfected her technique to inflict sound down to the bones, so plugging ears won't work. When the violin gets destroyed, she goes for the Academy's pipe organ.
- Named Weapons: Her Mushi violin is named Deathspellvarius.
- Peaceful in Death: She seems to be employed by a hospital's staff to let the elderly patients die in peace. She makes her mission to get let the plagues of society die without violence.
- Put Them All Out of My Misery: She honestly believes she's doing everyone a favor by letting people die early with no pain, and still doesn't consider it a murder.
- Villainous Legacy: She is the second Deathly Violing Boss, taking over from her twin sister Yuriko who was defeated by Yui two years ago.
- Well-Intentioned Extremist: She hears that Yui possesses a powerful Mushi of her own and tries to kill her before it takes over, any collateral bystanders be damned.
Asuka Ashuradera
The girl boss of Nara.
- Hand Blast: Her Halo attack can melt a mountain.
- Meaningful Name: Her design and powers resemble an Asura, just like her name.
- Multi-Armed and Dangerous: She has an extra pair of hands.
Himiko
The ancient Mother of Mushi and the girl boss of Yamatai kingdom.
- Ancient Evil: She's been an active girl boss for 1800 years.
- Big Bad: She's the shadow master of all girl bosses in Japan and the creator of Mushi.
- Beethoven Was an Alien Spy: She's the Queen Himiko from Japan's Yayoi era and also a Mushi-breeding girl boss.
- Faux Affably Evil: She has a melanholic personality and shows no hostility to Yui, treating her effectively as her child. She drops the facade when Yui starts to resist.
- Mother of a Thousand Young: She views girl bosses as her daughters and all Mushi, which there are countless of, are stated to effectively be pieces of her.
- Obliviously Evil: It's heavily implied she never checked outside her tomb except checking on Yui and still believes her Mushi are protecting Yamatai from enemies.
- Reflective Teleportation: She can uses mirrors as doors and also to spy on her targets.
Others
"Mai-Nyun"
A trendy karate prodigy who wants revenge against Yui in Black for what happened when they were kids.
- Dude Magnet: Mai-Nyun had "five or six" boyfriends while in elementary school.
- Loves My Alter Ego: Likes "Mio-Nyun" (Yui in White) and views Yui Kamio as a bitter rival she wants revenge on while not knowing they are the same person.
- Only Known by Their Nickname: "Mai-Nyun" is her In-Series Nickname, her real name is unknown.
- Revenge: Yui has delivered her a Curb-Stomp Battle in the kid's karate tournament, taking away her sponsors and boyfriends. Mai-Nyun has been looking for a payback ever since.
- Social Media Before Reason: During the climax of their rematch in Chapter 4, as she has Yui in Black in a wrestling lock, she lets the spectators take some Insta pics of them.
- Tomboyish Ponytail: Has a ponytail that hangs off the right side of her head.
Kara's Special Agents
A squad of adults who are sent by Kara to upstage Yui during the school's sport festival.
- Demonic Possession: When Kara gets possessed by a Mushi, Shingo and Genzo get taken over by minor Mushi as well and gain magic.
- Gas Mask Mooks: Shingo Takayanagi is former French Foreign Legionnaire who wears the full camouflage gear along with a gas mask.
- Famous Ancestor: Genzo Makabe is said to be a descendant of the Oniwaban of Kishu.
- Ninja: Genzo Makabe is dressed and acts like a shinobi, and is also a descendant of one.
- Scary Black Man: Usami Min is an adult Jamaican with a scary face who participates in school's sports after Kara bribes the teacher.
- Smoke Out: Shingo Takayanagi a smoke grenade to disorient Kiito and Yui in order to try to get the latter's hair chain.
Guard Corps of Yui in Black
A pair of girl delinquents who adore Yui in Black and steal Sanzo chains to challenge Kiito for his position as the guardian.
- Famous Ancestor: Considering her family name, Garasha is a descendant of Christian damiyo Akechi Mitsuhide via his daughter, Hosokawa Gracia.
- Fangirl: They want nothing more than for Yui Kamio to rule over street gangs once again even though Yui doesn't know them and couldn't care less.
- Named After Somebody Famous: Garasha Hosokawa is named for her ancestor Gracia Hosokawa.
- Ninja: Maria Kiyohara is a descendant of a ninja clan and is good at theft.
- Stalker with a Crush: They've been around enough to know Yui's secret and during the Pop Quiz challenge show to know her private life as well.
- True Sight: Maria has a cat-eyed "Visual Jutsu" that lets her see people without clothes.
