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Mari Yukari's best friend, and The Protagonist of the story. Shortly after befriending her, she is kidnapped and her arm is sawed off, but is fixed by Yukari, using Hatou's own cellphone as supplemental parts.
- Ascend to a Higher Plane of Existence: In chapter 16, she becomes the narrator.
- Cursed with Awesome: Her left hand is imbued with a cellphone, giving her the ability to call people. On the downside, it can only be used when no one is looking, using it takes a toll on her body, and her left hand, well... is a cellphone.
- She has the power to draw information from an infinite number of possible realities, more than making up for its weaknesses. She's a living information network.
- Determinator: So much so that she literally kills off the very probability of herself giving up on her quest.
- To Hatou, getting killed isn't a setback, it's an opportunity to figure out her mistake. She purposely invokes Trial-and-Error Gameplay in order to find the best solution to her problems.
- The Dulcinea Effect: Essentially the main motivation for her actions. Deconstructed by how far she will go to realize her goal.
- Insane Troll Logic: She actually invokes this in order to fuel her power. Hatou can communicate with herself. Her parents make up half of her genetic makeup. Therefore, Hatou's parents are part of her. Because of this, Hatou can hijack her parents, and it doesn't stop there. She manages to work up her family tree, gaining the power to hijack pretty much anyone. There are limits to this power however, as she states that there are certain individuals like Yukari that she cannot control, and while she gains the physical information of what her target does, she doesn't understand their mental reasoning of why they do something. Through this, she manages to hijack Yukari's mother in one of her failed attempts to save the former.
- An earlier example occurs. Hatou wants access to more power. She can jump between different universes. Every universe is different and holds its own possibilities. She interprets this to mean that anything can happen. Through this logic, she deducts that there is a universe where magic exists. She finds that universe, and through it, becomes a Magical Girl.
- Killing Your Alternate Self: She does this a few times. Once to a version of herself who had decided to give up on her quest, and another version of herself simply to check whether or not Hatou Manabu is actually important to the mission.
- Magic Feather: Her initial cellphone upgrade turns out to be one. She always had the ability to communicate with parallel worlds. What it did do however, was awaken her power. Once she realizes this, the limits on her Mental Time Travel drops.
- Magical Girl: Through her powers, she realizes a universe where magic exists and she becomes a Magical Girl.
- Physical God: by chapter 15, she's able to do practically anything, including magic, taking over other people, run the world, you name it, except save Yukari.
- Schoolgirl Lesbians: Subverted. Hatou!Prime is straight. One of her counterparts on the other hand, becomes lovers with Alice. The main Hatou is shocked by this. This isn't just Played for Laughs, it's also a major plot point. It provides her a realization on how parallel universes work, allowing her to jump to past selves.
- Bi the Way: Eventually kicks into this. In one universe, she enters a relationship with a boy for her own enjoyment, while caressing and loving Alice later on in the same.
- Super Power Lottery: She's won it, by far.
- Ripple Effect-Proof Memory: Her initial ability. She can see and communicate with her alternate selves. Eventually, it's used for...
- Multiple-Choice Past: She has the ability to observe parallel universes, allowing her to make the correct choices to meet her desired outcome. This gives her access to...
- Mental Time Travel: After discarding the idea of timelines, she gains the ability to change the past up until she gains her power. Eventually, she drops this limit.
- New Game+: She can invoke this, sending back any info and experiences to a parallel, past self.
- Reality Warper: A part of the reason why her ability is so powerful is because it's based on her perception. Through it, she gains a weaker variant of this. Through it, she manages to create a set of realities where magic exists simply by perceiving it as a possibility, and turning those possibilities into some of the many unlimited parallel universes.
- Thou Shalt Not Kill: Defied. Alice and her replacement are killed multiple times by parallel versions of her.
- Took A Level In Bad Ass: Invoked. It happens as a result of her many parallel selves working together towards a single cause.
- Took a Level in Jerkass: Hatou!Prime goes from a friendly girl into The Chessmaster and a Manipulative Bastard who toys with the emotions of others in order to reach her goals.
- Walking Spoiler: Just look at this page and try to admit you can talk about Hatou, without revealing something.
- Yandere: At this point, she seems to be one.
A girl with a very strange way of perceiving the world: All life forms other than herself appear as robots to her. It soon proves to be far more than a mere hallucination.
- Alone in a Crowd: From her perspective, she's the only human being in a world full of robots. While to everyone else she just looks like a normal girl, she's never seen another person who looks anything like herself. This has led her to some uncertainty about just what exactly she is.
- Awesomeness by Analysis: In addition to making her a Gadgeteer Genius, her strange vision allows her to assess a person's abilities based on the components of their robot form that she sees.
- Brain in a Jar: She ends up as one after her death.
- The Cutie
- Deuteragonist: The second most important character after Hatou.
- Gadgeteer Genius: She can analyze, build, and repair complex machines, and even turn toy plastic models into autonomous, functioning, intelligent robots.
- Genius Ditz: She is very ditzy, but also very talented in building and fixing things.
- Hypocrite: In chapter 17, Yukari exclaims to Hatou after she had ascended to a higher plane that only she can decide her fate, and Hatou shouldn't decide and enforce what's best for her. Nice sentiment, but remember how Hatou got her powers. Yukari enforced her will to save Hatou by implanting the cell phone in her arm. Something Hatou didn't consent to. It's the same with her childhood friend Nanami, during her accident as a child from which she suffered trauma over. For an example that wasn't life or death, look to the serial killer. She disassembled the girl in order to perform HeelFace Brainwashing. Remembering those instances, her words come off as pretentious, stating it's only wrong when others force their intentions on her, but when she's doing it to others, it's okay.
- Just a Machine: To Yukari, there is no difference between humans and machines. Rather than lessening the value human life, this causes her to regard machines with the same value and importance as humans.
- Killed Offscreen
- Living Macguffin: In the latter half of the story, Yukari's importance to the plot is based more on Hatou's desire to prevent her death than Yukari's actions. Treating her this way is actually why Hatou could never save her: Yukari decided her own fate. It's only once Hatou treats Yukari like a person again could she convince her to save herself.
- Magical Eye
- Purple Eyes
- Put on a Bus
- Reality Warper: Her unique vision even allows her to dismantle, reprogram, and rebuild human beings just as if they really were robots.
- Sacrificial Lion: Her death sets Hatou's quest in motion.
- Super Empowering: She inadvertently gives Hatou her powers by building a cell phone into her hand.
A girl who was once friends with Yukari. She frequently picks on Yukari, but the former doesn't seem to mind. She was the first person Yukari "fixed", having been injured in a playground accident when they were younger. Awake throughout the ordeal, she was traumatized by the incident, breaking their friendship. Despite her behavior, she still cares about her friend.
- Foil: She's one to Hatou. Both were friends of Yukari, both are aware of her perception, and both were saved by her. However, she assumes the worst of Yukari, believing that she views humans as mere robots, while Hatou assumes the opposite, thinking that she sees robots as humans. Ultimately, Hatou turns out to be correct.
- Trauma-Induced Amnesia: In one universe, it's implied that Tenjou has forced herself to completely forget that Yukari once "fixed" her injuries by rebuilding her with parts of a jungle gym and simply remembers Yukari as a bit of a quirky classmate.
- Wise Beyond Their Years: Turns out to be very intellectual for her age. She brings up discussions with Hatou about the philosophical zombie, the qualia, and quantum physics.
Another gifted girl like Yukari. She flies to Japan in order to recruit her into JAUNT, an institute for genius children like her. She can perceive mathematical equations as pictures and solve them through instinct.
- Dark and Troubled Past: Her mother was a drug addict who saw her as demon made to punish her. Her uprising resulted in massive issues in her self-esteem.
- Inferiority Superiority Complex: Her superiority complex stems from her lack of self-esteem, which came from her abusive uprising.
- Insufferable Genius:
- Schoolgirl Lesbians: She appears commonly as Hatou's love interest in the many parallel universes.