What is it?

Welcome to Sin Triangle! Sin Triangle is a three part coming-of-age story following the lives of Vocaloids. Be sure to check the characters section to learn more. This AU is not affiliated with any official Vocaloid media.The setting is a fictional suburban town somewhere outside of Seattle, WA. Tucked away in the trees is a private high school, renowned for its music program. We follow the lives of various students as they learn and grow up.

• Characters
• Chapter Summaries

Links

• Tumblr
• Archive of Our Own

Character List

• Miku Hatsune
• Piko Utatane
• Mayu Kobayashi
• Len Kagamine
• Fukase Satori
• Rin Kagamine
• Gumi Megpoid
• Aria Plannettes
• Yukari Yuzuki
• Nana Macne

Chapter Summaries

Chapter One
Miku Hatsune is a disgraced child actor whose first album was just released and mocked viciously. Not only is her music career dying, but she’s facing rumors of being a pain to work with. Unsure of where to turn, she places the pressure on her manager, Kaori.Kaori has no solutions until a fateful call with an old friend sparks a new idea. Kaori proposes that Miku take some time off and live with her friends, Meiko and Kaito Kagamine. Miku is hesitant at first, but after thinking it through, she decides to go with it.Miku arrives in Seattle, where the Kagamine’s live and has a hard time figuring out what to do with herself. She doesn’t get much time to know her new housemates, the couple’s teen twins, Rin and Len, but finds herself trying to judge them based on what little she knows. So far, Miku thinks Len is cool enough, but holds some distaste for Rin.The sentiment is shared by Rin, who later vents to Len about their fears. However, Len easily calms them down and they share a family moment.

Miku Hatsune

Basic Info
Pronouns: She/Her
Age: 17
Birthday: 10/28
Birthplace: Denver, Colorado
Zodiac: Scorpio
Height: 5'3Personality
Strengths: When she wants something, she's determined to get it. She's a hard worker.Weaknesses: She's entitled. She didn't have much parental support growing up, so she closes herself off and doesn't ask for help.Fears: Being unimportant.Soft spot: Her closest friends, especially Len.Temper: Miku is quick to anger. She's been used to getting everything she wants since she was very young, so she's disillusioned with the real world. When things don't go her way, she tends to get angry.Discipline: Miku is against a lot of rules. She's in a bit of a "Disney star gone wild" situation following her first album's release. She is rebellious and prefers to do what she wants.Dreams/Wants: At this point in the story, she doesn't really have any. She doesn't know what she wants to do with her life and that makes her angry, but more than anything, afraid.Hobbies:
- Singing
- Shopping
- Secretly reading fanfiction about her favorite tv shows

Piko Utatane

Basic Info
Pronouns: He/Him
Age: 17
Birthday: 9/13
Birthplace: Seattle, Washington
Zodiac: Virgo
Height: 6'3Personality
Strengths: His wit. He can decimate people in arguments. When close to someone, he can be very kind.Weaknesses: He's closed off. He has a cold exterior which usually turns people away.Fears: Failure/not living up to his own expectations. He fears that he isn't good enough. He wants to be the best and when he feels less than that, he tends to spiral.Soft spot: Animals and old people. He could snap at you with a sarcastic comment and then turn around and tame a feral cat.Temper: Piko tends to be impatient. He has low tolerance when it comes to distractions and things he considers obnoxious or frivolous.Discipline: Piko is generally a rule follower. He questions authority but doesn't break rules just for the thrill of it. If he thinks a rule isn't right, he won't follow it.Dreams/Wants: At the root of it all, Piko wants to be happy. He takes most of his actions because he believes that they will lead to a happier future. As for career aspirations, Piko wants to be a lawyer.Hobbies:
- Speech and debate
- Reading
- Gaming

Mayu Kobayashi

Basic Info
Pronouns: She/Her
Age: 17
Birthday: 3/4
Birthplace: Allentown, Pennsylvania
Zodiac: Pisces
Height: 5'4Personality
Strengths: She's very kind. She has very good manners and cares deeply about the wellbeing of others.Weaknesses: She takes people's words to heart too often. She lets negative comments eat away at her.Fears: Being ridiculed.Soft spot: Animals.Temper: Not quick to anger. She tends to bottle up her emotions and when they come out, they come OUT. She can be a bit petty and jealous if left unchecked.Discipline: Follows rules most of the time, but has a rebellious streak that comes out when you least expect it.Dreams/wants: Mayu is very passionate about theatre and wants to become an actor. Like most of the characters, she wants to be surrounded by loved ones and feel comfortable in her own skin.Hobbies:
- Musical theatre
- Baking
- Sewing/fashion

Len Kagamine

Basic Info
Pronouns: He/Him
Age: 17
Birthday: 4/11
Birthplace: Eugene, Oregon
Zodiac: Aries
Height: 5'11Personality
Strengths: Charisma. Len could probably make friends with anyone he wanted to be friends with. He has a lot of compassion.Weaknesses: He's selfish and short sighted. He often fails to see the perspectives of others.Fears: Being hated. He hates rejection and gets depressed when reminded of his own shortcomings.Soft Spot: His familyTemper: Len is an easygoing guy. It takes a lot to get him angry. If he is upset though, it's likely because a friend has hurt him or themself.Discipline: Len follows rules decently. He'll break a few rules here and there. He hardly breaks the rules and standards he sets for himself.Dreams/Wants: Len is the type of person to go with the flow. He wants to be happy and see where life takes him.Hobbies:
- Basketball
- Singing
- Playing piano

Fukase Satori

Basic Info
Pronouns: He/Him
Age: 17
Birthday: 11/29
Birthplace: Spokane, Washington
Zodiac: Saggitarius
Height: 5'10Personality
Strengths: He's kind and funny. He never fails to endear people to him.Weaknesses: His insecurity. He's deeply insecure in both his personality and appearance.Fears: Being abandoned.Soft Spot: His mother, Miki.Temper: He's an easy going person. At this point in the story, he's a bit of a doormat.Discipline: He tends to stick to rules. He'll break a few here and there, but not many.Dreams/Wants: He wants to make other people happy. He wants to help people and provide for his mother.Hobbies:
- Painting
- Musical theatre
- Fashion

Rin Kagamine

Basic Info
Pronouns: She/They
Age: 17
Birthday: 4/11
Birthplace: Eugene, Oregon
Zodiac: Aries
Height: 5'6Personality
Strengths: She's true to herself and doesn't change herself for others.Weaknesses: They tend to assume the worst from people and act on that perception. This leads to a lot of misunderstandings and avoidable conflicts.Fears: Not being unique.Soft spot: Her family.Temper: Rin is a bit stand-offish by nature. They aren't super aggressive, but they'll stand up for what they think is right passionately.Discipline: Rin doesn't care much for arbitrary rules. She regularly breaks the dress code and calls out ridiculous rules.Dreams/wants: Rin is, surprisingly, very interested in the entertainment business. She doesn't want to be a star, she'd rather shine from the background. They're driven by the love of their family and friends and want to be surrounded by them in the future.Hobbies:
- Drawing
- Cosplaying
- Writing

Gumi Megpoid

Basic Info
Pronouns: She/Her
Age: 16
Birthday: 6/29
Birthplace: Seattle, Washington
Zodiac: Cancer
Height: 5'6Personality
Strengths: She's very confident and intelligent. She could be called a textbook overachiever, but she's so genuine that no one could call her a try hard.Weaknesses: She tends to neglect her own needs for the needs of others.Fears: She's most afraid of being perceived as someone she isn't.Soft spot: She loves kids! She's a very good babysitter.Temper: Gumi doesn't get angry often, but when she does, she is a force to be reckoned with. Won't hesitate to call someone out on their bullshit.Discipline: She's a part of the student council and a strong athlete, so to remain in good standing, she's quite the rule follower. Sometimes she wishes she could step out of her comfort zone.Dreams/Wants: Gumi is deeply passionate about education, so wants to become a teacher of some kind. Overall, she wants to make a change and help others. For herself, she just wants personal satisfaction and love from others.Hobbies:
- Musical theatre
- Softball
- Playing violin

Aria Plannettes

Basic Info
Pronouns: She/Her
Age: 16
Birthday: 4/23
Birthplace: Portland, Oregon
Zodiac: Taurus
Height: 5'9Personality
Strengths: Her positivity. She has a very sunny outlook on life and it can be very infectious. It's easy for her to make others smile.Weaknesses: She's very sensitive. Her moods can change quickly and she has a hard time regulating her emotional responses.Fears: Being rejected.Soft spot: Nature, especially plants.Temper: Ia is a soft spoken girl and doesn't really like to rock the boat. That isn't to say she's timid, far from it, but rather that she avoids conflict. She's more likely to respond to conflict by crying rather than arguing.Discipline: She follows rules pretty decently. She takes shortcuts here and there, but she doesn't think about the rules often.Dreams/wants: Ia wants to live a comfortable life doing what she loves with the people she loves. She wants to be a biologist.Hobbies:
- Drawing
- Researching random topics on Wikipedia for hours at a time
- Science

Yukari Yuzuki

Basic Info
Pronouns: They/He
Age: 17
Birthday: 2/18
Birthplace: San Diego, California
Zodiac: Aquarius
Height: 5'5Personality
Strengths: They've got their head on straight. They're very rational and good with planning things.Weaknesses: A bit detached. He tends to present as being very aloof. Cares a lot more than her lets on.Fears: Showing vulnerability.Soft spot: Small, cute animals.Temper: Not easily swayed. He's pretty neutral about most things and if he's angry, he pushes it down. Prone to gamer rage.Discipline: Generally follows rules, but forgets a few here and there.Dreams/wants: Wants to live a simple life with the people he cares about. He wants to be a computer programmer.Hobbies:
- Coding
- Gaming
- Composing music

Nana Macne

Basic Info
Pronouns: She/Her
Age: 17
Birthday: 5/24
Birthplace: Amarillo, Texas
Zodiac: Gemini
Height: 5'5Personality
Strengths: She's peppy! She brings good morale to the people around her and fires them up.Weaknesses: She can be very petty. She hold grudges, even if they're miniscule.Fears: Being left behind.Soft spot: Her family. She lives with her single father and her four sisters.Temper: Fiesty, but not quick to true anger. Otherwise, pretty chill.Discipline: Pretty neutral. She does her own thing and that usually lines up with the rules.Dreams/wants: Nana wants to be a journalist. Her family runs a diner, but she doesn't want to take over the business.Hobbies:
- Writing
- Cooking
- Sewing