Kasane Teto 《🌹Rose woman》

Main Info: Kasane Teto (重音テト) is a Japanese (and later English) UTAU who was originally created as a troll "VOCALOID" by fans. Her surname 重音 (Kasane) literally means "heavy sound" or "overlapped sound;" while these interpretations are widely accepted among fans, TWINDRILL has not released any announcements about the meaning of the name. Her name テト (Teto) comes from Tetopettenson, a parody song of Le Beau Tambour. Although her original voicebank was only for use in UTAU, many people still mistook her for a VOCALOID (and still mistake her for one to this day). Though she had no final voicebank released for the VOCALOID engine, there were attempts in 2012 to release Teto for VOCALOID in collaboration with AH-Software Co. Ltd., and she later had a private beta voicebank with Crypton Future Media, Inc. in 2017. She later released as a speech voicebank for the TALQu text-to-speech synthesizer in January 2022, an AI singing voice database developed by AH-Software for Synthesizer V Studio in April 2023, and an AI text-to-speech voice library also by AH-Software for VOICEPEAK in April 2025.

Personality: Kasane Teto can best be described as a "jerk with a heart of gold". She has a rather flamboyant personality, constantly showing off, much to Megurine Luka dismay. At times, others can find him to be overbearing and overly confident. In her own way, she is seen as selfless. Due to her outward flamboyant personality, she can be quite teasing at times, callingher fellow singers "Princesses" and often picking on Megurine Luka. In truth, however, Kasane Teto appears to be capable of understanding, seeming to know Luka on a personal level and goading her into speaking honestly quite often. It is important to note that—unlike most of the Utaus hiding in vocaloid media, who have done some sort of villainous obsession—Kasane Teto doesn't really do that. She’s more of less a determined antagonist. In stark contrast to Megurine Luka, Kasane Teto indicates, at least outwardly, that she and the six other main utauloids are above the confines of the prophecy and do not have to abide by the rules of fate. Kasane Teto also appears rather manipulative initially, using Hatsune Miku’s nostalgia for the past to get her to stay within the Sekai and directing her away from Kagamine Rin. Despite that, Kasane Teto genuinely cares for Hatsune Miku, only wishing to repay Miku’s past care and kindness towards her and the other Utauloids by maintaining the Forbidden Sekai as a "perfect world" for Miku. To this end, Teto brushes off most of Miku’s outbursts to prove the existence of Forbidden Sekais and does not appear offended when she claims to be playing along. Kasane Teto carries an air of resentment toward Friends family, blaming Kagamine Rin, Meiko, and Kaito for Miku’s loneliness and current plight. However, it is shown repeatedly Kasane Teto’s dislike of Rin is actually rooted in observant distrust. At one point Kasane Teto directly asks Rin if they even truly love their Best Friend. Kasane Teto is fully aware that it was Rin who created Sekai and directly accuses them of trying to compromise Miku’s safety due to their dual allegiance. As such, he directly challenges the vocaloid's convictions and beliefs, pointing out the hypocrisy of Megurine Luka covering for Rin’s repeated creations of the forbidden sekai’s and Kagamine Len for continuing to keep Akita Neru's Basement’s shatter sekai while trying to seal off her own. Despite this, Kasane Teto is aware Miku’s Forbidden Sekai will not last due to the Roaring and is willing to sacrifice herself. Kasane Teto is also shown to greatly care for her fellow Utauloids as well, so much so that they all lend their powers to her during her final battle. In the end, Kasane Teto suggests she hesitated to overpower Rin in the climax of their battle, suggesting she could not fully bring herself to seriously hurt Kagamine Rin. She also willingly risks (or sacrifices) her own life to try to stop the Roaring Megpoid from taking Miku, despite knowing she would likely lose. At her core, Kasane Teto is a highly shrewd individual, even on the verge of death. She waits for Rin to leave to direct Len toward the shelter code hidden within her light world container, anticipating Rin would attempt to destroy it.

Story: Kasane, along with the other Utau voicebanks, was supported by none other than the great Hatsune Miku as a proposal to Meiko in their lesbian relationship. Although they were supposed to only last for one day, Hastune Miku continued to nurture and care for them, and the Utau-voicebanks wished they could repay Miku. It’s even indicated that Hatsune Miku took (at least Teto) to the other sekai with her as well (though this is contested by Luka). Kasane Teto indicates she has watched Miku’s other newly made friends get more popular over the years. When hard times hit Miku, such as her friend Gackupo growing sick, Meiko divorcing Miku, and Miku’s money running out, Miku still continued to care for the Utau’s, causing them to feel weak and useless for not being able to do anything to help Miku in her hard times. In Chapter 1, Kasane Teto and the rest of Utauloids can be seen in Miku’s shop in their respective containers, with Miku musing they still persist after all these years. In Chapter 4, the other Vocaloids have the opportunity to use the Organ to play songs. Playing the melody for "Your Girl’s Best Friend" (Teto’s motif) prompts both Luka and Len to comment on it, with the latter describing the melody as annoying. Later in the 3rd Sanctuary, the party stumble across a prophecy panel depicting Hatsune Miku next to one of her red Utau-voicebank’s with the text reading "THE ROSE WOMAN, TRAPPED IN ASYLUM". The Utau-voicebank in the panel is heavily implied to be Kasane Teto [note 1]..

Chapter 5, Upon Kasane Territory's creation, Kasane Teto is given a human form and has Luka placed in a Fish Crate to avoid Hatsune Miku seeing her. Kasane Teto is first met by Kagamine Len and Kagamine Rin in the beginning of the forbidden sekai, after being seen talking to Miku. She greets the vocals, introducing herself and explaining who she is. her flamboyant behavior annoys Luka, who claims that she shoved her in a crate earlier. When Hatsune Miku arrives, Kasane Teto quickly covers them in grass before taking Miku somewhere else to partake in pleasantries. Shortly there after Kasane Teto "defeated" a Utau by trapping them in a bush, and leapt into Miku’ arms to protect him. The vocals spot Hatsuhe Miku and Kasane Teto on various locations doing various things together, such as fishing, watching a cowboy show, and discussing Rin’s old hobbies. Eventually, after another encounter, Kasane Teto briefly replaces Luka in the party and later assists them with a few puzzles. At a restaurant known as the Super Diner, Teto and Miku are seen again, where they talk about a similar interaction Miku once had, before Kasane Teto gives her Sekai Soda and a mixtape to listen to, while Len gets some root beer (made from actual roots). Upon leaving the diner, Luka still expresses disdain towards Teto. len, however, thinks she could actually be helpful to them, as she's keeping Miku distracted while they look for the Fountain. When he asks her to help with a switch puzzle to open a door, teto agrees, much to Luka’s annoyance. Kasane Teto solves the puzzles herself by skateboarding across the buttons, more to Len’s appreciation and Luka’s frustration. When Miku shows up nearby, Flowery hides the three again. Hatsune Miku is impressed with Kasane Teto’s skills, but she says that she would be happier with her friend Kaito. Kasane Teto agrees but takes Miku away. In the marshy area of the Garden, the vocals meets Teto again. Teto advises they leave, guiding them to a bright open light leading back to the Light World. Of course, they refuse to go until they have sealed the Shatter sekai, but Kasane Teto assures that Hatsune Miku will be fine, though the party believes otherwise. After obtaining the Petal Feather, the three make it back to where Miku and Teto are discussing images of voicebanks they have. While talking, !iku shocks the heroes by asking Miku about the Dark Fountain. Teto, confused, agrees to show it to her later. Down below, Len gets angry with Teto showing Miku the Shatter, so the Vocals follows her up to the Cliffs. Upon reaching said location, they see the Shatter sekai in the distance but also encounter Kasane Teto and Hatsune Miku, the former of whom is shocked to see them there, and Teto immediately sends her a castle in the distance. When Teto suggests Rin, Len and Luka "leave it all to them," saying it's best that Miku doesn't see them anymore, Len angrily tells Teto off for her actions, warning her that Asgore is in danger of being taken by the Megpoid. Teto claims it's "nothing [they] can't handle on [their] own," but Luka warns her that the Megpoid will kill her. The Three stay firm on their word, and so does Teto, who decides that they'll settle this at Kasane Territory and leaves. At the entrance to Kasane Territory, Kasane Teto appears once again, saying that it's better for them to leave Miku alone so that she can have the perfect home and family she has always wanted. Despite this, Len tells him that they have to get Miku out regardless, arguing that it's not what she wants. To this, Kasane Teto calls Hatsune Miku to come out, who is wearing her most gorgeous dress. Miku is again shocked to see Rin and Len and throws them out of the Shatter Sekai and out of Kasane Territory, warning them not to come back. Len tries to break and enter but realizes that if they did, darkness would likely spill out, alerting more Vocaloids/Fanloids and putting them in danger as well. Fortunately, they remember the back door, which they go back into the Forbidden Sekai through. They land back inside Kasane Territory, though unfortunately in a jail cell, as Teto had anticipated their arrival. When they escape the jail, they see Miku is looking at notes about the Shatter Sekai, though Teto blows the Three vocals away so she can hang out with Miku, along with the other Utaus. Later, Miku explains to Teto that she wants to find the one responsible for creating the Shatters and make them pay for everything they've done. However, right after, Teto decides to take her to the diner. Rin and Megurine Luka encounter Teto again, who makes it clear that they will be sealing the Shatter Sekai regardless, though she asks if whomever made their Shatter is really bad, which shocks Luka. Having nothing to say, or with Luka not wanting to say anything, Teto leaves. At the top of the castle, the Utauloids are together, wanting to make Miku happy, having been trying so hard to do so. Teto goes to meet Miku, who announces that she will go to the Shatter and find the one who made it, with a grim path planned for them. Teto finally decides to send Miku there, while the three vocals makes amends with the Utaus. However, Utauloids reminds them that the three plan to seal the Fountain, ending Miku’s perfect world. Despite all their efforts to be friends, the Seven Utaus decide to fight tLen, Rin and Luka anyways, leaving one by one. Teto leaves last, pointing out that her friendship with the Utauloids is much stronger than what Rin has, expecting to see them at the Top of Castle. With no other option, Len decides to follow Rin to the end and go on out to the Top of Castle. At the very end of the castle rooftops, Teto affirms that they want to fight, but that she and the others will be the true heroes, using the power of all the other sekai members that they recruited, as well as the other Utaus. Thus begins the final battle. When Luka takes the fall near the end of the battle, Len gets the idea to throw Rin up the vines to the top, where the Shatter is. Teto tries to stop them, combining with the other utaus to become SYNTHESIZER-V, but is ultimately defeated. Despite this, Kasane Teto won't give up and demands Rin get up, only for Miku to interrupt, having changed her mind about the Forbidden Sekai. However, Teto objects, reminding Miku about everything they were planning, before Miku reveals that she was just playing along, though he admits to enjoying it. In fact, Teto’s efforts only made her realize how it feels to receive unasked-for attention. Even if she wanted to stay in the Shatter Sekai, she couldn't, as the shop still needs to be operated, which Teto understands. When Rin goes to seal the Fountain, they still remain in the Dark World, as someone has just made a second fountain. Suddenly, the Roaring Megpoid appears and captures Miku. Kasane Teto gives chase and attempts to engage in combat with them, but her efforts prove futile, and Gumi Megpoid ultimately overpowers Kasane Teto and delivers a near-lethal blow, causing Teto to bleed flowers. Luka attempts to heal Teto, and though Luka’s Sekai Abiliyy can't heal Teto’s wound, she continues trying. When Rin and Len arrive, Teto explains that as Utauloids, they are neither Sekai members nor Vocaloids; they are living beings that gain consciousness in the Forbidden Sekai, able to feel things others can't. She warns the three about a greater unforeseen threat underneath their town but assures them that no matter the dark path ahead, there's still a glimmer of light inside them all, hoping that they will succeed in the end. Despite her regrets over being seemingly useless, Luka assures Kasane Teto that she still gave Hatsune Miku something she cares for, giving her a purpose. And so, Kasane Teto gets to die happy, becoming a Utau with a broken Voice Bank. In the Light World, Teto’s file is fucked up, with data spilling on the floor, so Len looks for something to help. Examining Teto’s voicebank, Rin notices the “other utaus”, as well as a piece of paper in the moutains of data, the latter of which contains a code for the Shelter, "0915199X." len returns with tape and patches Teto up, leaving Kasane Teto’s fate unknown.

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Relationships

Hatsune Miku: Due to knowing and being cared after by Miku since her college days, Teto holds immense love and loyalty to Miku and considers Herself as Miku’s best friend. Knowing about Miku’s financial decline, divorce from Meiko, and anguish over the sickness of her friend, Kasane Teto felt immense sadness she could do nothing but watch. To this end, Kasane Teto wishes to have Kasane Territory serve as an ideal paradise for Miku for as long as possible, knowing it will not last due to the threat of the The Roaring. Kasane Teto goes to great albeit misguided length's to keep Miku happy, primarily by distracting her from her woes over her friend group, entertaining her along with the utauloids, taking her fishing, or taking her to the diner. Teto will also physically hiding anything she feels would trigger a complex reaction out of her, primarily doing so with Luka (for somewhat resembling Kaito but with abit of Pink) and Rin, due to mistrusting their intentions. When this doesn't work, Kasane Teto is willing to physically transport Miku away from them. However, Teto is aware that Miku’s tendency to obsess over the truth of Shatter Sekai’s is a detriment on herself and the other Utauloids, at multiple points blowing away her documents and encouraging her to play with the other Utaus to no avail. However, teto never takes offense to or feels lightened by these outbursts, ultimately allowing Miku to continue her investigations even when her affection is directly labelled as unwanted. Part of this protectiveness is indicated to be due Kasane Teto knowing Miku is a target for the Knight, and seemingly implies Rin made Kasane Territory to place her life in jeopardy. As such Kasane Teto was willing to fight off the Megpoid to save her regardless of the likelihood of her succeeding. Additionally, the internal code of The Diner Song of Best Friends is labelled flowery_diner_romantic, suggesting Kasane Teto’s feelings for Hatsune Miku are more than platonic. Though, that last part is up for interpretation.

Kagamine Rin: Kasane Teto has a complicated, antagonistic relationship with Rin. Initially, Kasane Teto greets Rin and treats them amicably, claiming "they've grown like a turnip" and referring to her and her mirror twin Len as "my favorite two." However, teto slowly begins to drop this pretense over the course of their stay in Kasane territory, telling Rin they "were" a good kid, but it is best they stay away from Miku. Upon giving Kasane Teto food items, she will occasionally ask Rin if they truly love Miku. Later explicitly telling Rin that they, their caretaker, and Kaito have brought Miku misery and pain, once more asking Rin to leave. During their final confrontation, Teto directly accuses Rin of planning something that will endanger Miku, appearing to be aware of their implicit connection with the Roaring Megpoid. Kasane Teto appeared to know Rin would try to find and destroy the shelter code hidden in his light world soil patch and warned Len to find it first and not tell anybody. Despite these facts, Kasane Teto admits she held back against Rin in their final battle and did not publicly reveal to Len that Rin had made Kasane Territory.

Hachune: Teto and Hacune are members of the Seven Utauloids group from Kasane Teto serves as their leader. while Hacune is a mischievous, hyperactive member

Defoko: Defoko smart

Rei: Brave Robot that calls Kasane Teto “Big sis”

Zundamon: Kind utauloid

Neru: Tsundere Justice seeker

Otomachi Una: good friend with integrity

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Appearance

Forbidden Sekai: Kasane Teto has a white dress shirt with a green and brown vest on top. On the green side of the vest there is a small golden flower pin. She wears brown dress pants with black shoes and Miku’s jacket, which she holds behind her. And her Red twindrills have a mix of yellow, with one of her drills having a rose

Lightworld: just a Crimson Rose.