Characters / AI: The Somnium Files - Mizuki Date

AI: The Somnium Files | Main Index
Protagonists: Kaname Date | Mizuki Date
AI: The Somnium Files (Iris Sagan) | AI: The Somnium Files - nirvanA Initiative

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Mizuki Date née Okiura

Voiced by: Tomoyo Kurosawa (Japanese), Corina Boettger (English)

12 Years Old

^{18 Years Old (As in nirvanA Initative)} 

I'm not afraid of any yakuzas. I'll make their hearts stop beating in three seconds!

Introduced as the twelve-year-old daughter of Renju Okiura and Shoko Nadami, Mizuki has been living with Date for four years following her parents' divorce. Normally unusually perceptive, mature, and physically strong for her age, the discovery of her mother's dead body at Bloom Park renders her traumatized and mute at the start of the game.

By the time of nirvanA Initiative the now 18-year-old Mizuki joins ABIS as a rookie Special Agent just in time for a break in the Half-Body Serial Killings case to occur. She inherited Aiba after losing her left eye in the course of the HB Case's initial investigation six years ago.

---

A-D

• Abusive Parents: Shoko was utterly unfit to be a mother, even striking Mizuki on occasion, and Renju prioritized managing his business and Iris's well being over taking care of her. This led to Date taking her in prior to the first game.
• Ace Custom: In nirvanA Initiative as an ABIS agent, she has a customised Evolver called the Evolver-MC (Mizuki Custom) and a telescopic pipe.
• A-Cup Angst: As a high school senior, she does not take it well when someone mentions her lack of bust size. Aiba (who's no more or less endowed) often fights with her over it.
• Adoption Angst: She doesn't take it well learning that Renju and Shoko were not her real parents, meaning a large chunk of her already screwed up childhood was a lie. That said, she still thinks of Shoko and Renju as her parents even with that complication.
• Adoptive Name Change: Her last name is changed from "Okiura" to "Date" after the events of the first game.
• Affection-Hating Kid: Played for Drama; Mizuki is a Mouthy Kid who rejects Date's attempts to bond with her, frequently with an insult or snarky quip. However, it's eventually revealed that she's incredibly jaded and miserable, and isn't used to getting affection from others due to her Abusive Parents and Date's busy work schedule. Gradually she starts to let down the walls as she learns to cope with her trauma.
• The Ageless: If Bibi-who implies that her condition is Chikara's youth experiments brought to fruition-is any indication, it would apply to Mizuki as well although hers and Bibi's growth hasn't been stunted like Shoma.
• Amateur Sleuth: Despite having way less experience as an investigator than Date, she still manages to be a competent detective when the chips are down, being the one to take on the HB killings after they've been unsolved for six years.
• Ambiguously Human: For reasons that are never even touched upon, Mizuki has super human strength. She is able to make super human jumps, knock down trees with a single blow, and take out a legion of armed guards with guns single handedly with nothing but a pipe. She mentions that her Grandfather was raised by dolphins. Date can't even call her out on that because of just how scary strong Mizuki is. nirvanA Initiative reveals that she's actually a Designer Baby clone specifically designed to be a Super-Soldier.
• And Now for Someone Completely Different: Near the end of her route, you play as her after Date falls in a coma, and have to go into his Somnium to try to wake him up.
• Animal Motif: She's got a slight rabbit motif; she owns and cherishes a rabbit doll and is generally characterized as energetic, able-bodied, and cute. nirvanA Initiative takes it further when it's revealed Chikara's lab-name for her was "Rabbit", and is signified in Bibi's Somnium as a rabbit plush about to be experimented on.
• Aww Look They Really Do Love Each Other: For all of their bickering, she and Date share several moments that show the two really do love each other:
  • Date is there to assure Mizuki, who's suffering from a massive guilt complex caused by parental abuse, that her terrible upbringing wasn't her fault.
  • At the end of her route, Mizuki is left as the only one who can save Date from his coma, venturing into his Somnium to save him. This leads into the climax of her begging Date to stay alive for her.
  • In nirvanA Initiative, after Date's been missing for so long, he and Mizuki share a touching reunion at Brahman, even echoing their special greeting.
    Date: "Mizuki... I'm home."
    Mizuki: "...Welcome back."
• The Baby of the Bunch: At eighteen, she's the youngest member of ABIS and the one with the least training by the time of the second game. Boss considers something of an intern still and is hesitant to send her into such a big case. The age difference is even reflected in her job routines, like how she has to get around on a scooter while Date and Ryuki have cars, or how she's not old enough to drink with all the adults.
  After Boss offers to buy everyone drinks: "No fair..."
• Beauty Is Never Tarnished: Mizuki gets the crap beaten out of her by Tearer's forces in the climax of the second game, which is represented by her being caked in dirt rather than having any visible injuries.
• Being Good Sucks: She really doesn't want to implicate Amame for Tearer's death, but her crimes are too severe to let her walk once the whole truth starts coming out.
• Benched Hero: In the finale of the first game, Saito shoots her in the leg after she stops him from killing Date. She's forced out of the rest of the final battle because of that.
• Big Damn Heroes: In the Resolution route, she charges at Saito right as he's about to kill Iris in front of Date.
• Big "NO!": Upon seeing Renju's corpse.
• Blood Knight: She sometimes a little too eager to fight her way out of situations, often cracking a grin even when surrounded by a dozen or so enemies.
• Braids of Action: She has them in the sequel, nirvanA Initiative.
• Bratty Half-Pint: Once she starts talking again, she immediately turns to sass as her default mode. Justified by her being twelve years old and dealing with a lot of family drama, even before the horrific events of the game.
• Breakout Character: Was the winner in this post-game favorite character poll, even beating out the main protagonist duo of Date and Aiba. It was to much fanfare that she was revealed as the new main protagonist in the sequel, nirvanA Initiative.
• Break the Cutie: Seeing her mother's corpse left her so traumatized, she became temporarily mute. She experiences several more breaking moments throughout the game, especially on the path that leads to her route. In nirvanA Initiative she also does NOT take The Reveal of her being a Designer Baby clone and not actually being Renju and Shoko’s kid well.
• Broken Bird: By the end of the Annihilation route, she's both lost her parents and best friends, the former she saw dead up close. In the end, she's worn down from all of the repeated trauma and can barely respond to Date when he speaks to her.
• Brutal Honesty: She's pretty blunt when it comes to her impression of Kagami.
  Kagami: "You don't remember [me]? We did talk for a bit..."
  Mizuki: "Umm... Sorry, don't remember... You don't leave much of an impression. In a good way."
  Kagami: "In a 'good way'?"
• Bully Hunter: Date finds out she became this when asking about some kids who bullied her.
  Mizuki: "They stopped bugging me as soon as I threatened to fight back. They targeted some other kids instead. They did terrible things... So I... Broke all of their front teeth."
  Date: "Geez..."
• Bully Magnet: She got bullied in grade school because kids found out about her family situation and mocked her for it. Date found her one day roughed up after she got into a fight and decides it's time to teach her self-defense.
• Bunny-Ears Lawyer: A sassy, vain, teenaged girl with Super-Strength, Blood Knight tendencies, and an affinity for stuffed animals. When the chips are down though, she proves to be every bit the ABIS agent that Date before her, even saving the entire world at the end of the second game.
• Caged Bird Metaphor: A prominent theme in Mizuki's Somnium, as the merry-go-round she's trapped in is stuck under one and Aiba is later forced to knock one of two over to symbolically free her.
• The Cavalry: One-third of the cavalry in Iris's and the true end routes, along with Ota and Moma. She is the only member of the trio who reappears in nirvanA Initiative's rendition of the trope, with the others being replaced by Gen and Lien respectively.
• Clones Are People, Too: She is the genetically perfected clone of Mizuki Kuranushi, but no one thinks of her as any less of a person after learning this and she quickly forms a sisterly relationship with the original.
• Cloudcuckoolander: Even at eighteen, Mizuki has a bit of a habit of letting her imagination run wild. During investigations, her deductions can get a bit outlandish, like guessing that a body was catapulted into a baseball stadium, or guessing that a culprit licked a blood splatter on the floor. Aiba often has to reign her in.
• Commonality Connection: Played for Laughs; if there's anything that makes her and Aiba close, it's their mutual vitriol towards Date. The two will always dream up of excuses to kick his ass on the spot (not that it's hard to do).
  Mizuki: "Aiba, permission to shoot [Date]?"
  Aiba: "Granted."
• Conditioned to Accept Horror: The tremendous emotional shock she suffers after losing her parents in the first game (finding her mother’s corpse in particular), followed by a consequent process of trauma and healing made Mizuki into a seemingly mentally stable child, but one who doesn’t flinch at the sight of death anymore. At the early parts of nirvanA Initiative a still young Mizuki outright tells Ryuki seeing gruesome dead bodies doesn’t bother her too much, she, a 12 year old, is the one comforting her older friends like Iris and Kizuna who react accordingly to witnessing such horrors.
  Kagami (investigating a body): "Wait, hey! This is no place for a kid!"
  Mizuki: "What do you mean?..."
  Kagami: "I mean, you're right next to the body!"
  Mizuki: "So?"
  Kagami: "'So?!...'"
  [...]
  Mizuki: "I'm fine, I've seen worse..."
• Contrasting Sequel Main Character: Compared to Date, Mizuki brings a different energy to the role of POV in the second game. She's often way more energetic, easier to agitate, and a lot more excited when fights break out. She also tends to be just as, if not more, imaginative than he is, sometimes bordering on Cloudcuckoolander territory. After all, while Date is a Manchild, Mizuki is still a literal minor.
• Cool Bike: Her seemingly cutesy blue scooter with an Adorabbit decal has retractable rocket thrusters.Bibi has one just like her. And in the final battle, they use the bikes to propel themselves towards a rocket that's just reached escape-velocity.
• Covert Pervert:
  • During the epilogue of nirvanA Initiative, Mama consults her magic balls to ask who has the biggest penis before answering that it's Lien. Mizuki blurts out that's what she figured, earning the shocked silent stares of Mama, Bibi, and Aiba. Mizuki quietly asks that they never bring this up again.
  • When examining the interrogation room mirror after Lien's Somnium, her immediate instinct is to compare the situation to voyeur porn.
• Crazy-Prepared: Apparently. Her backpack that she so frequently carries around has everything from swiss army knives to a grenade, but she's never shown using any of these items.
  Date: Hey, Mizuki. What's inside that backpack you always have on you?
  Mizuki: Well... Water, dehydrated bread, chocolate, biscuits, a flashlight, a hand charger, Swiss army knife, a candle, matches, triangular badges, a first aid kit, whistle, portable toilet, a plastic bag, duct tape, a grenade, a magnet, disposable hand warmers...
  Date: Do you have an entire disaster relief kit in your bag?
  Mizuki: Better safe than sorry. I'm ready for anything.
• Cute Bruiser: This cute kid can punch hard enough to cause shockwaves and take out scores of mooks in combat, at eleven years old! At eighteen, her fighting prowess is increased even further, and she's no less of a looker.
• Daddy's Girl: As much as she can get on Date's nerves, he'd do anything to make sure Mizuki is safe and happy, especially after her or the Resolution route. By that time, he adores her and goes into full Papa Wolf mode if someone even threatens to harm her. Since she has no mother figure, she's also feisty and tomboyish and is eager to join her adoptive dad in fighting crime (at first, he's not so keen on the idea as he doesn't like seeing her endanger herself, but this does die down with time).
• A Day in the Limelight:
  • Following the raid on Sejima's estate and Date's hospitalization in Mizuki's route, she is offered to Psync into Date to help him regain consciousness. Thus, you'll be controlling Mizuki for a Somnium instead of Aiba (who had been destroyed by a gunshot).
  • Half of nirvanA Initiative is from her perspective as one of the two playable protagonists, alongside Ryuki. Although in reality it's closer to a fourth. Half of the time spent playing as "Mizuki" is actually Mizuki "Bibi" Kuranushi, the true identity of the Masked Woman.
• Decoy Protagonist: Somewhat. While central to nirvanA Initiative's advertising and being who you start the game out playing as (first game spoiler toggle aside), she spends almost all of the first half of the game on the sidelines while you play as Ryuki. Additionally, on the main route half of the time you're playing as her you're actually playing as Bibi. Despite this she does get ample screentime and she is the one who ultimately prevents the Nirvana Initiative.
• Does Not Know Her Own Strength: Exaggeratingly so; when first learning martial arts under Date, she punches hard enough to blow the trees around her. She plays herself down though as "weak" which was why she didn't fight back against the bullies (and wound up breaking their front teeth when she later did), leaving both Date and Aiba agape and speechless.
  Date: "She doesn't know her own strength.."
  Aiba: "I suppose not.."
• Dude Magnet: According to Aiba, Mizuki does get asked out somewhat frequently, but she turns them all down due to her high standards.
• Dumb Struck: Mizuki is traumatized after discovering her mother’s body at the start of the game and becomes unable to speak. She recovers, either through Date and Aiba’s intervention in her Somnium or after Hitomi holds her for an entire night in the hospital and gives her a chance to cry.

E-N

• Extremely Protective Child: When the going is tough, she'll protect Date with her life. She even risks a bullet to the leg to save Date from Saito's clutches.
• Eye Scream: In nirvanA Initiative, Mizuki lost an eye in the explosion at the cathedral, and it was replaced by Aiba. The NIL Ending where the explosion didn't happen due to Ryuki arresting Tearer early still results in her losing an eye, albeit willingly parting with it so she could house Aiba in its place.
• Fair Cop: She hasn't lost her cuteness as an agent of ABIS, somethings she's happy to flaunt when she can.
• Fangirl: For Adorabbit. She collects his merchandise and even gets extremely excited to see Shoma has an Adorooster plush.
• Foil:
  • A lot of parallels can be drawn between her and Iris: children of single parents (and both adopted), disappeared dads, have close relationships with Date, and both end up being heavily involved in the New Cyclops Killings. But the dynamics to their similarities are starkly different.
    • Mizuki being Date's kid is the result of a very abusive childhood, and as a result their relationship, while mutually caring, is very tense. Iris meanwhile grew up happily with Hitomi and has utmost gratitude for her love, but Hitomi also keeps the darker elements of their relationship, like Iris's adoption and Hitomi blackmailing So, a secret from Iris.
    • Mizuki's father Renju, while he cared for her, was very distant because of his Workaholic habits, and then he suddenly completely disappears at the start of the game. Iris meanwhile never got to know her birth father, and her father surrogate disappeared at some point in the past (and it turns out Date is said father surrogate, meaning both Mizuki and Iris are effectively his kids).
    • While Iris is very friendly and teasing towards Date, Mizuki is prickly and hard to approach for him; even Iris has to mediate for the two. Date is fiercely protective of the two as a result, though while Mizuki joins him in the action, he's usually the one to bodyguard Iris.
    • Mizuki gets dragged into the investigation by the death of her parents, not having any kind of significant relation to the killer on her own, and ends up becoming one of the biggest contributors to bringing in the killer. Iris as it's revealed is personally tied to a lot of players involved in the case, including the killer himself, the victims, Date, and the man who tried to cover everything up in the frist place.
  • To her co-star Ryuki; Ryuki is soft-spoken, easy to fluster, and prone to keeping his snark internal. Mizuki meanwhile is brash, cocky, and has a very abrasive attitude when provoked.
• Foreshadowing: Comments to Date on her path that she believes a "family" is defined by bonds of mutual affection, rather than blood. By the end of the Resolution ending, she, Date, Iris, and Hitomi are likley to soon become a family through marriage and adoption, despite none of them being biologically related.
• Friendly Rivalry: In the second game, she and Aiba often argue over which of them is the cutest. Somehow Boss, the Masked Woman, and Pewter get involved too.
• Glass Cannon: Mizuki throws one hell of a punch, but she has a bad track record for taking one back. In the climax of the first game, she gets incapacitated by a single bullet to the leg when she tries to lay the beatdown on Saito. In nirvanA Initiative, even though everyone is standing roughly the same distance from the explosion, Ryuki, Lien, and Gen were able to walk away with only moderate injuries while Mizuki lost an eye and had to be carried out, and like all other AI protagonists, she's down for the count if you miss even one QTE.
• Girls Love Stuffed Animals: She has a plush bunny toy called Adorabbit. Initially, she didn't like it at first for its uncanny appearance, but she soon grew to like it and even introduced it to Iris who adores it too. Mizuki received the toy as a birthday gift from Date, who didn't know what she wanted and just bought the toy for her instead. Even in Date's Somnium she can't bear to hurt it.
• Guest-Star Party Member: Mizuki tags along with Date for several chapters on the left side of the first game's flow chart, even sneaking along by hiding in the back seat of his car.
  Date: (spotting Mizuki in his rearview mirror) "Mizuki!!"
• Gun And Sword: More like "gun and pipe". She wields both in tandem as an ABIS agent.
• Guys Smash, Girls Shoot: Inverted; Date fights mostly with a gun while Mizuki is the one bludgeoning bad guys with a metal pipe.
• Happily Adopted: Ends up legally adopted by Date in the true ending, and though she may not show it outwardly her behavior on the her own route shows that she actually does love Date like a father figure.
• Harmful to Minors: As a twelve-year-old girl in a murder mystery game, Mizuki goes through trauma no child should have to.
  • The story begins with Mizuki discovering the mutilated corpse of her own mother. Initially, she's so traumatized by the event that she's rendered Dumb Struck by it but eventually recovers. She's still slightly shaken but gains resolve to help Date find the culprit responsible. Things potentially get worse from there; Her father is murdered, her best friend is kidnapped (and watches her also get murdered depending on the route), watched her last remaining family almost die in front of her, and gets shot in the leg by a Serial Killer. And that's only the first game.
  • The second game begins with her watching a dead body appear out of nowhere in front of her. Then in the first half of the game, she loses an eye and her father figure goes missing for six years. Then she finds out after a timeskip that she's result of horrific human experimentation that involved cutting her open as a toddler.
• Heal the Cutie: Through both sides of the first game's branching routes, Mizuki gets to have some semblance of closure for losing her parents, either by Date being there to personally help her through her trauma (Her route) or by finding comfort in her friends and teacher (Resolution Route). Though she's still a bit prickly, which seems pretty natural after all the shit she goes through, she shows to be in a much better place by the end of the game-or at least anything other than the Annihilation Route.
• Heroic BSoD: Has a bit of an existential crisis when she discover she is a Designer Baby made in a cloning lab and not really Renju and Shoko's daughter at all. It's only after her friends convince her that Clones Are People, Too that she calms down.
• Heterosexual Life-Partners: Is noted to be very close to Kizuna, who refers to her as "Big Sis".
• Hot-Blooded: She can get pretty pumped, mostly in the second game.
• Identical Twin ID Tag: In the first game, she gets shot, leaving a scar that is the only unalterable visual difference between her and her sister/older clone Bibi.
• Improbable Age: In nirvanA Initiative, she is the president of Lemniscate, owner of Sunfish Pocket cosplay café, and ABIS agent. Mizuki states that the former two was due to inheritance from her father after his death, which happened when she was only twelve years old.
• Improbable Infant Survival: Mizuki is the only character who isn't legally an adult, and one of three main human characters (alongside Date and Pewter) who never dies in any of the routes^note outside of one possible Non-Standard Game Over. That isn't to say she isn't put through the wringer, what with both of her parents being murdered and having to find one or both of the bodies depending on the route.
• Inexplicably Awesome: She has outrageous Super-Strength, to the point of being able to beat up multiple adult men, bench press 100kg, jump several times her whole height, and so on. This is commented on, making it clear it's actually intended to be unnatural, but it's not until nirvanA Initiative that we get any kind of explanation for this. It turns out that she was genetically modified, giving her superhuman abilities.
• Insult of Endearment: She always calls Date some variant of "creepy old man". He gradually stops being bothered by it, just accepting that it's part of their banter.
• Intergenerational Friendship: In the first game, none of her friends are around her age. The youngest of her other friends, Iris, is still more than five years her senior. This changes in the sequel with the introduction of Shoma.
• It's All My Fault: She views herself responsible for her parents' abuse, divorce, and subsequent murders, convinced that if she had only been a "good girl" none of that would've happened. Date assures her that this isn't true.
• Jerkass Has a Point: She's particularly disrespectful and snarky towards Date, but she has a point that Date spent years not getting to know her, so suddenly trying to learn more is off-putting.
• Jerkass to One: When she recovers from her aphonia, it's shown Mizuki is a very polite young girl... to everyone but Date, despite living together in the same house for years. Her reasoning comes down to Date's overly perverted personality, his childish antics, and him being distant from her, the latter of which her neglectful father hoped to avoid by putting Mizuki in his care. Luckily, as Date becomes a proper parental figure, Mizuki is able to clearly demonstrate how much she cares about him.
• Late-Arrival Spoiler: By the sequel, it's kinda hard to keep the fact that Date adopts her a secret when they share a last name now.
• Like Parent, Like Child: At eighteen, she shows to have picked up a few of Date's habits, both good and bad; she's got the same banter-filled dynamic with Aiba that he has, displays perverse thoughts, talks to herself, and is generally quite childish for her age. Even some of the jokes she has with Aiba in Somnia mirror Date's from the first game.
  • Even her design as a twelve-year old loosely mirrors Date's. Like him, she's got a high-collared leather coat, ties her hair back, and wears black leggings. Her yellow coloring is even complimentary to his purple.
• Little Miss Snarker: Mizuki is often very sarcastic and blunt with her words, especially towards Date who she's constantly taking jabs at him. A lot of it is symptomatic of her deeply rooted emotional trauma.
• Little Miss Badass: Mizuki is much stronger than her size and frame would suggest. In one route, she joins Date in fighting off So Sejima's armed bodyguards and takes out half of them with a metal pipe. In another, she does the same with a large number of heavily armed mercenaries.
• Locked Up and Left Behind: When Date tries to further investigate So Sejima, Mizuki gets attacked and left Bound and Gagged inside one of the hollow speakers in Date's apartment as a warning to stop the investigation.
• Logical Weakness: Since she can't be matched in physicality, enemies resort to knocking her out by overloading her senses, like with tear gas. So's men use this to incapacitate her in her route. Then Saito-as-So does so again to take her hostage.
• Most Definitely Not Accompanying Us: No matter how hard or how often he tries, Date almost never manages to get her to stay safe at home, far away from the action. The only time he succeeds, she is very angry at him.
• Mouthy Kid: Mizuki, despite being 12, acts as though she's in her late teens and never fails to deliver a snarky insult while resisting Date's attempts to bond with her, even while recovering from discovering her parents' bodies.
  Mizuki: I knew you were a pedo Date, but I didn't think you were a cougar hunter too.
• Muscles Are Meaningless: For all of her Super-Strength, she's got almost no muscle definition on her body. This makes her strength deceptive to those who don't expect it, leading to multiple occasions where she's told to stay back with her casually commenting that she's tougher than she looks. As her powers are a result of experiments in her childhood, she was born with this.
• Mystery Magnet: Even before joining ABIS as a teenager, she finds herself involved in different bizarre and horrific crimes, starting with discovering her mother's dead body. Then the second game begins with Jin Furue's body appearing in front of her and her friends, all of which culminates in her discovering the second half of the same body six years later.
• Nice Girl: Despite her conflicted relationship with Date, she’s pretty friendly to everyone else, and naturally still cares about him at the end of the day. It really shows when she's around Iris or, as an ABIS agent, has to talk to regular civilians.
• No Guy Wants an Amazon: 18 year old Mizuki laments that she can't find a boyfriend, and supposedly it's because her Super-Strength intimidates any potential suitors. In the games, the only boy Mizuki's age is locked into a 12 year old body so there's no confirmation if this is actually the case.
• No-Holds-Barred Beatdown: She delivers an absolutely vicious beatdown on Saito for almost killing Iris. He barely gets away by shooting her leg.
  "What do you think you're doing to Iris?!"
• Non-Idle Rich: At the end of the first game, she's become extremely wealthy from inheriting everything from her late father Renju including Lemniscate and Sunfish Pocket to the point she can simply pay off the bills to Date's apartment at age 12. In nirvanA Initiative, she's still active as an ABIS agent. This serves as a bit of foreshadowing where Mizuki sometimes asks Boss for a raise despite being well-off, since this is actually Mizuki Kuranushi talking.
• Non-Indicative Name: Her Ace Custom Evolver-MC isn't a revolver; it's a modified derringer pistol.
• Not So Above It All: As much as she looks down on Date and dismisses him as an idiotic old man, in nirvanA Initiative she's taken on some similar behaviors, such as playing around talking to herself when Aiba's not in her head, expressing vanity towards her looks, and having some (albeit less blatant) perverted tendencies.

O-Z

• Oblivious Adoption: She is actually a Designer Baby clone made to be a Super-Soldier, and in fact she is the second of her template; the older one is also named Mizuki.
• One-Steve Limit: Averted. Her older sister/prototype clone is also named Mizuki. She defies this later, nicknaming the older one "Bibi" to avoid headaches.
• One-Woman Army: Mizuki is easily one of the strongest characters in the series; she generally holds her own well when fighting solo, brute forcing her way through fights while Date has to rely on Aiba's insane calculations to get out of tough situations. nirvanA Initiative places a greater emphasis on combat because of the shift to Mizuki's POV. And in that game's finale, she briefly goes without Aiba so the latter can help an overwhelmed Date.
• Out of Focus: Despite being Date's "roommate" and the daughter of the initial murder victim, Mizuki doesn't have that much relevance outside her route. Unlike her route where she has to cope with both of her parents being dead, we don't see her reaction to her father's death in the "true" route, since we don't find out about it until the climax of the story, and then next time we get the chance to really talk to her, she is already Date's adopted daughter.
• Parental Title Characterization: It should be noted that she refers to Shoko as 'Mom', and Renju as 'Daddy', whereas the former abused her, but the latter, while neglectful, also treats her more kindly.
• Parrying Bullets: In nirvanA Initiative, she's able to swat away bullets with her pipe and even back to the shooter, on top of Spin to Deflect Stuff.
• Pervert Revenge Mode: Likely a side-effect of living with Date for several years. It's to the point where as an 18-year-old, she'll reflexively yell at herself for looking at her own legs through Aiba's X-Ray function.
• Pipe Pain: Mizuki's strange obsession with pipes also extends to using them in combat, as shown during the raid on So Sejima's mansion, where she defeats several grown men armed with guns by hitting them with her pipe. It helps that she's also a Pint-Sized Powerhouse. One of the few possesion in Date's apartment is her favorite Iron Pipe. Date is a bit worried about that. In the sequel, nirvanA Initiative, she wields a pipe with electronic enhancements as her primary weapon.
• Please, Don't Leave Me: In the climax of her route, she begs a Somnium version of Date not to leave her, even rejecting copies of her parents standing across from them, showing that he's truly the only family she has left and that they both need each other, despite how much he doubts his ability to be there for her.
• Precision F-Strike: In the path to nirvanA Initiative's true ending, her reaction to walking into a room simultaneously containing the thought-missing Kizuna, the thought-dead Date dressed as Gen, and half of a dead body is an exasperated, "Oh, what the fuck?!"
• Promoted to Playable: She becomes one of the main characters in the sequel, nirvanA Initiative.
• Proud Beauty: As an 18-year-old, she'll happily proclaim her own cuteness.
  Mizuki: "In all seriousness, I might just be the prettiest girl on the planet."
  Boss: "..."
• Repressed Memories: At first, there’s no explanation for why “Iris”/Manaka’s frozen corpse appeared in Mizuki’s Somnium. It turns out Mizuki had repressed the memory of finding her body when she investigated the cold storage warehouse, which kept her from mentioning it during the investigation.
• Retool: She not being biologically related to her parents is an obvious revision for nirvanA Initiative, since Shoko Nadami's appearance was designed to look as much as a biological mother would need to be towards her daughter.
• Right for the Wrong Reasons: She is convinced, particularly during the left side story arc, that there is no way that her dad Renju killed her mom, that someone else used his phone and his car to take the body to the merry-go-round in Bloom Park. She's both correct and incorrect. Renju physically WAS the one who did all those things, but mentally it was someone else who stole his body. Renju's mind was actually killed in Shoko's body.
• Sarcastic Devotee: Mizuki secretly sees her adoptive father as her real family, but that doesn't mean she's above mercilessly mocking him when he needs to be taken down a peg. Even outside of that, she is always sarcastically aware of his faults.
• Say My Name: Screams Date's name as he takes a gunshot to the eye for her.
• Scars Are Forever: She gains a scar on her leg after Saito shoots her there. The fact that it's only sometimes visible in the sequel is a hint that there's more than one of her running around.
• School Uniforms are the New Black: Her school uniform is part of her look as an ABIS agent, being worn under a yellow police vest. It's even the same one Iris and Amame wear when Ryuki visits their school.
• Seen It All: By the second game, she's pretty accustomed to being around dead bodies (due to seeing her mother's in the first game). At age twelve, she can calmly sit near Jin Furue's severed half to ponder it, something that unnerves Kagami.
• She Is All Grown Up: By the time of nirvanA Initiative, she's grown into a tall, strong young woman and is a Special Agent of the Tokyo Metropolitan Police.
• Significant Name Overlap: She shares a name with Mizuki Kuranushi, her older sister/clone. This obscures the fact that Side Mizuki switches between the two of them.
• Single Woman Seeks Good Man: Mizuki at one point, while examining herself, laments not being able to find a boyfriend despite being the Proud Beauty she is. Aiba's reply indicates that it's her personality that's getting in the way.
  Mizuki: "Why is it I can't seem to find any decent men?"
  Aiba: "Because you've rejected every man that's come close to you."
  Mizuki: "Because they're all pushy, basic bros."
• Smash Sisters: She and Bibi aid each other through multiple combat encounters and have a really tight synergy, which makes sense given their styles are similar.
• Sour Outside, Sad Inside: It becomes clear that Mizuki's a good kid with a righteous heart, but years of neglect, abuse, and trauma have made her incredibly prickly, particularly with her last remaining family, Date. She gradually lets this attitude go as she comes to terms with all of the hurt she's gone through. By the second game, she's in a much better place attitude-wise and can hold a relatively pleasant conversation with Date.
• Stealth Insult: She takes an opportunity to diss Date in front of Iris, all to the latter's complete ignorance.
  Mizuki: "Thanks for letting me stay last night."
  Iris: "Oh, no trouble at all! Anytime. You could even live with me if you want."
  Mizuki: "Haha, that's a great idea! The roommate I have right now really sucks..."
  Date: "This girl..."
• Stepford Smiler: She puts up a strong front despite being orphaned within the span of a few days. In her route, she's finally honest to Date about how much pain she's in and how much she needs him.
• Strong Family Resemblance: She's got the same teal hair as her mother.
  • Exaggerated further by her and Bibi, given that Mizuki is a clone of the latter.
• Stronger with Age: Her superhuman strength only seemed a little absurd when she was 11 years old in the first game, and 12 years old early on nirvanA Initiative; easily lifting 100 kilograms, jumping several times her own height, "basic" stuff. Then she turns 18 years old, and Mizuki might as well be a super heroine at that point, moving at super speeds, generating shockwaves with a swing of her pipe, topping it all off when she lifts, although with much effort, a chemical vat that definitely weights several tons^note Technically the vat lift was Bibi, but since Mizuki is outright said to be her "complete version", she can likely do it too.
• Super Gullible: Date fools her with a story about the belly button needing to be rinsed before praying in Shintoism. When she tells the same story to Ryuki, Date is trying his hardest not to laugh at her naivety.
• Super-Speed: In nirvanA Initiative, Mizuki has become fast enough to easily dodge machine gun fire and Speed Blitz multiple opponents. A few scenes have her running so fast that she looks like a blur.
• Super-Strong Child: She has superhuman abilities, as demonstrated by her knocking down trees, bench pressing 220 pounds without breaking a sweat, and holding her own against large numbers of armed bodyguards and mercenaries. Not really the case in nirvanA Initiative, as she's seen quite a growth spurt.
• Surprisingly Realistic Outcome: Mizuki may be extremely strong and fast to an almost supernatural degree, but she still has the body of a 12 year old girl. It only takes one gunshot to the leg for her to be disabled and scream out in pain.
• Talking in Your Sleep: Mizuki sees in Date’s Somnium that Date first gave Mizuki his bed after hearing her call for her parents in her sleep.
• To Be Lawful or Good: In nirvanA Initiative, Mizuki has to decide whether to pursue Amame for the mounting evidence against her as the killer of Uru, or try to let her friend off the hook for her justifiable behavior. Ultimately, she decides to go with the former, but doesn't feel good about it.
• Tomato in the Mirror: Not only does Mizuki discover that her previously-inexplicable strength comes from genetic modifications, but she later discovers that she is actually a clone, with the Masked Woman being the "original" (as neither Mizuki was the product of normal human reproduction) Mizuki.
• Tomboy and Girly Girl: The Tomboy to Iris's Girly Girl; Mizuki is regularly snarky to Date and is an exceptional fighter while Iris is a professional idol with a particular love for dancing.
• Took a Level in Badass: nirvanA Initiative shows that she's honed her fighting abilities since the first game, as well as being given access to ABIS-standard weaponry, making her a much more formidable fighter.
• Took a Level in Cheerfulness: While still prickly she's generally more easygoing and perky in nirvanA Initiative.
• Trademark Favorite Food: Her bio lists three: unagi, tonkotsu ramen, and Date's stew. These are all used as plot devices at certain points.
  • In the wake of her mother's death, Date can offer Mizuki one of her listed foods as a treat for when his job is down, all before venturing into her Somnium. Mizuki will remind him of this throughout the rest of her route.
  • Date's Somnium at the end of her route shows one of the earliest memories they shared together: Date preparing a bowl of stew for her to cheer her up. It helps the two realize how much they truly care for each other.
• Tragic Dream: When visiting Marble for the first time, she mentions offhand that she would've liked to visit a bar when she's older with her father, just so she can spend time with him. This conversation comes after she finds him dead. This is still the case in the Golden Ending where Renju was actually killed in Shoko's body from the start and his actual body died from natural causes.
• Trauma Conga Line: Where to begin?...
  • She grew up with neglectful parents who then divorced and gave up custody of her to a family friend. Then she discovers her mother dead and mutilated in an abandoned park. If you're on the Annihilation route, this is all immediately followed by her discovering her father also dead, then both her best friends being murdered on live camera. And even the route right next to that has Date nearly die saving her from a bullet and put into a coma that she personally has to wake him up from. Canonically she has it much better, but still loses both parents, has to take part in a hostage rescue, and is shot in the leg.
  • The second game barely lets up on the poor girl either; she and her friends have a bisected corpse spawned in front of them, one of her closest friends is kidnapped by a Serial Killer, said serial killer detonates a bomb that takes her eye out, and her adoptive father goes missing for six years with no trace. And THEN she finds out she's the result of horrifying human experiments conducted on children which got her separated from her older sister, said sister almost dies of a heart disease trying to save her, and the two of them have to save all of humanity from a bioweapon by detonating a thermite bomb midair. Holy shit this kid needs a break.
• True Companions: She fully trusts Date, Iris, and Ota as her friends.
• Tsundere: She constantly argues with Date, calls him names and doesn't give him any respect. Despite this, as her route reveals, she is very dependent on Date due to her rocky relationship with her family, and she sees him as more of a family member than her parents. Ironically, Mizuki calls Date this trope in her ending, which she isn't exactly wrong about either. And while she likes to tease Date and Ota, she's very warm and friendly when she's together with Iris.
• Ugly Cute: In-Universe, where she initially found Date's Adorabbit gift as ugly which is understandable given it's a cartoony mutated rabbit covered in bandages, but eventually grew to love it to the point where she refuses to hurt it.
• What the Hell, Hero?: In her route, when Date tries to leave her home away from the investigation, she lambasts him for how inconsiderate that sentiment is when it's her parents that are the ones who were murdered, meaning Mizuki has all the more reason to seek justice than he's giving her credit for.
  "Date, don't you know how I feel?! My parents are dead! I saw their bodies with my own eyes. If I don't do something, I'm going to go crazy!... (tears start coming) Date, Please..."
• When You Coming Home, Dad?: Prior to the first game, Mizuki had a workaholic corporate executive father who left her to be raised by her abusive mother, never making an effort to spend time with her himself. After they divorced, he knew he was unfit to be a parent, so he left her to be raised by his best friend, Date. Date made much more of an effort to spend time with her, but because of her independent streak and his work as a police officer, he often left her alone. After her mother's murder and her father's disappearance Date is gone night and day working especially hard to find those responsible, but gets called out by several people (including Mizuki herself) for not being there for her when she needs him most.
• Wise Beyond Their Years: Subverted. Despite being a smart girl for her age and she can be rather insightful, her wisdom stops about where you'd expect a pre-teen's to stop. Most evident whenever Date starts talking about more mature subjects, which Mizuki will (thankfully) not understand what he's referring to.
  Mizuki: "Hey, Date? Why do beer ads always have girls in bikinis in them?"
  Date (smirking): "Because they make you thirsty."
  (Beat)
  Mizuki: "Why?"
  Date: "I'll tell you when you're older."
• Working Out Their Emotions: In the wake of stressful events occurring in the first game, Date can find her bench-pressing in their apartment out of frustration. This also clues in to her monstrous strength for the first time.