History Characters / CHAOSHEAD

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* {{Chickification}}: Sena is presented as a very knowledgeable Gigalomaniac who escaped from a research facility as a child and can easily defeats NOZUMI porters on her own, but her efficiency decays in the last chapters and she suffers from TheWorfEffect when confronting Rimi or Suwa. She also dies in most of the character routes.

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* TakingTheBullet: In the [=NoAH=] version of ''Chaos;Head'', [[spoiler:he does this for Sena believing that he's invincible because of a cheat code he was told that would be activated. It doesn't work.]]

* AccidentalMurder: In ''Chaos;Head [=NoAH=]'' [[spoiler: she accidentally kills Sena during her character route because Kozue attacked her before she could undo the delusion she'd placed on Sena.]]

* ColdBloodedTorture: In ''Chaos;Head [=NoAH=]'', it's revealed [[spoiler: that for an entire year, Rimi was sliced, starved, waterboarded, as well as many other unseen forms of torture by Norose in order to make her awaken as a Gigalomaniac, to the point where she created multiple personalities for herself to escape the suffering.]]

* DeathOfPersonality: The crux of her entire backstory. [=NoAH=] reveals that [[spoiler:at a young age, Rimi lost her parents in a car accident, which orphaned her and eventually landed her in the custody of NOZOMI, who proceeded to begin torturing her to awaken her as a Gigalomaniac. The many years of inhumane torture were too much for her to handle, to the point that she began killing her heart (as in, mindwiping herself of her memories) in order to endure the pain, creating a new personality of herself every time.]] She's more or less a personality born of a delusion just like Takumi.

* FingerInTheMail: Happens when [[spoiler:she gets kidnapped.]] Although instead of a finger, [[spoiler:it's her whole hand.]]

** ''Chaos;Head [=NoAH=]'' reveals [[spoiler: that she is actually Mia, and Yua died in her stead after volunteering to go to a group offline meet up to make a good first impression on her behalf. That, coupled with years of neglect from their parents as Mia, her parents forgetting about "Mia" who was believed to be dead, and Mia blaming herself for Yua's death, caused her to believe she was Yua and develop a split personality. It also gave her enough mental trauma that seeing a delusion of her dead sister claiming that she took on a false persona is enough to push her past the mental brink to obtain a DI-sword and awaken as a Gigalomaniac.]] Angsty is correct.

* IdenticalTwinIDTag: She wears glasses while her twin sister Mia did not. In her route, [[spoiler: she also tells Takumi that Mia had a brown spot on her under her breasts that she doesn't have and pulls up her shirt to show him, only to reveal the spot that gives her away as Mia]].

* PsychologicalProjection: [[spoiler:She continuously push the idea that Takumi has some kind of split personality when in actuality she is the one with one and is refusing to accept it]].

* TwinSwitch: Yua states in her route that she and Mia would occasionally switch places to get each other out of having to attend things that they didn't want to go to. [[spoiler: The two had switched places on the night of the Group Dive murder, and Mia's intense guilt over unwittingly sending her sister to die in her place caused her to have a breakdown and start living as Yua.]]
* TwinThemeNaming: ''Yu''a and ''Mi''a, "you and me." [[spoiler: Also foreshadows that the reveal that Yua was actually the one who died in the Group Dive murder, and Mia has been living as her.]]

* {{Dominatrix}}: Takumi views her as one due to how scary and unfriendly she is. One of the questions that triggers Sena's route is admitting that he likes "being stepped on", and one of the first scenes of said routes involves her dragging him to a NOZOMI corp. building by putting a giant chain on his neck. This being up being averted, as her coldness toward others is part of her family issues and DarkAndTroubledPast.

* BewareTheQuietOnes: Kozue rarely talks to anyone and can't bring herself to actually speak aloud in the slightest. [[spoiler:If you anger her or get on her bad side, you will regret it immensely. She doesn't hold back against beating down and slaughtering those she considers to be "bad" in her eyes.]]
* BreakTheCutie: Oh boy, was she ever broken alright. In ''[=NoAH=]'' [[spoiler: she gets a second dose of it by the Noah II-influenced students, leading her to go on a killing spree]].

* [[spoiler:TogetherInDeath : In her route in Noah she and Takumi are shot by Suwa and die from their wounds after killing him, sharing a DyingDeclarationOfLove for each other]].

* GoOutWithASmile: [[spoiler:In the Blue Sky or AA ending, he dies smiling, after having achieved his goal of atoning for Noah II by having Takumi destroy it, while holding Nanami's restored hand.]]

* BitchInSheepsClothing: In the Sena Route of ''Chaos;Head [=NoAH=]'' [[spoiler: it is revealed via TheStinger that she's actually an agent of the Committee of 300, and it is heavily implied that she assassinated both Takumi and Sena after they destroyed [=NoAH=] II because [[TheyKnowTooMuch they knew too much about the Committee's true nature]].]]
* EvenEvilHasStandards: [[spoiler: While she has no problem killing off Takumi and Sena, she can't bring herself to do the same with the baby that was with them]].

** Played straight in ''VisualNovel/ChaosChild''. He is the one behind the Shibuya earthquake and MassEmpoweringEvent that drives the plot, but he is dead by then. [[spoiler: The primary villains were sent by the Committee to clean up his mess.]]
* HoistByHisOwnPetard: [[spoiler: When Takumi fails to destroy NOAH II, Norose smugly reveals that he is the only person that is able to get close to the machine. Takumi ends up abusing this information by throwing his D-Sword, impaling Norose and sending him flying into NOAH II with it, destroying it in the process.]]

* ForeShadowing: At the beginning of the story, Grim asks Takumi if he finds Girls who wear Glasses more attractive than others. Depending on Takumi's Answer, she may or may not wear Glasses, hinting that she and Grim are actually one and the same person.

The main protagonist, a 17 year old second-year student at Suimei Academy who barely visits school in the first place. He spends most of his time playing Empire Sweeper Online, in which he is the most famous and powerful player (known as [[SpellMyNameWithAnS Lightning-Fast Neidhart]]).

* Foreshadowing: At the beginning of the story, Grim asks Takumi if he finds Girls who wear Glasses more attractive than others. Depending on Takumi's Answer, she may or may not wear Glasses, hinting that she and Grim are actually one and the same person.

* ImaginaryFriend: Being the favorite "wife" of slightly deranged Takumi, she eventually started to manifest herself to him as a delusion.

* TheExtremistWasRight: While giving his Delusional clone some nasty social anxiety and paranoid delusions was a cruel thing to do, he turned out to be right in that it was the only way that Takumi could have overcome the RapidAging problem of the normal BlessedWithSuck aspects of Gigalomania.

* FakeMemories: Specifically, his life from the age of maybe 12 or so until starting high school.

* EvilOldFolks: Subverted, as he is not actually the one behind the New Gen killings. He also is actually 17 years old.

* TheHero: Though he very much doesn't seem like it at first, he ends up coming into his own and becomes the unexpected hero the world needed to stop Noah II by the end.

* AmbiguousDisorder: Her slurred way of speaking might cause you to think she's younger than she actually is, but she's a 16 year old who talks like a child. She fumbles words around alot and mispronounces many of them with her babyish type of speech. [[spoiler:The ''[=NoAH=]'' version of ''Chaos;Head'' heavily implies this is because she's stocked up too many antiparticles and relied too heavily on her negative delusions that they're essentially eroding her mind, which in turn affects her speech pattern.]]

* SugarAndIcePersonality: More heavily emphasized in her [=NoAH=] route where she gets into an embarrassing situation with Takumi and is easily flustered. In general however, she tends to constantly maintain a stoic front to hide her true feelings about how fragile she is after witnessing half of her family's traumatic murders, as well as running from her emotions with a wall of logic about how the world is run by electrical impulses and devices instead. She even has a ShoutOut to LightNovel/{{Sha|kuganNoShana}}na.

* {{Expy}}: Of ''LightNovel/HaruhiSuzumiya'''s Itsuki Koizumi, as the male friend of the protagonist who tries to help them but often makes them groan with his odd personality. They even share a voice actor.

* TwinSwitch: Yua states in her route that her and Mia would occasionally switch places to get each other out of having to attend things that they didn't want to go to. [[spoiler: The two had switched places on the night of the Group Dive murder, and Mia's intense guilt over unwittingly sending her sister to die in her place caused her to have a breakdown and start living as Yua.]]