I'll leave you all with some fun facts, this is the first outline I used for Y/n and some events (not the final) but as you can tell by the personality alone, the end is very different. Hope you enjoy.
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Y/n Flowers, Twin Brother of Ramona Flowers (Twin Link?)

Ethnicity: American

Looks: Light skinned, dark brown hair(High fade with Thick Textured Spikes), black/ brown eyes

Personality: Y/n presents a friendly, tough, independent exterior and behaves like a free-spirit. He does not hesitate to impose his views on Scott (such as criticizing the apartment he and Wallace live in) and can be quite bossy at times. He also maintains a mysterious guise, telling everyone very little about himself, at least initially. He also is shown to have a limited temper and patience, as when made enough his friends call him "the hulk" sense he gets stronger. Contradictory to that, Y/n is also rather humorous, quick-witted and sarcastic. However, his "mysterious" nature and tough exterior, are really just cover for him own insecurities. At the heart of things, Y/n is a runner. He fears commitment, not belonging anywhere, and failing, which was a huge factor of why he ran away from home. Like his sister, Y/n is afraid to face his past which is relentless for catching up, with him and Kim. Whereas Scott suppresses his memories of the past, Y/n literally runs from it.

Job: Book Author, Bartender, Chef, Band

Quotes:
* "Scott, If your life had a neck, I'd snap it. I'd snap your Life's neck."

* "I'm not going to apologize for leaving, but I want to apologize for not being in your life when you needed me."

* "Isn't this a bad situation?!"

* "Seven...YOU DATED SEVEN PEOPLE?!"

* "You underestimate the power of my bullshit!"

Powers:

* Control over Subspace, he can make any door he walks though a subspace door. He can also peer into someone's mind and explore their mind just by looking into their eyes, making them have a battle in their mind or making a false illusion to them. Added, he can come out of any Star shaped design or object.

* A Sub-Trac Card is a special card that can be used by Subspace travelers to open Subspace doors automatically. Ramona Flowers has one of these. She demonstrates its use when she and Scott are fleeing Roxie in Volume 4. She remarks that Roxie is too cheap to have one of these cards, indicating that they have to be purchased.

* "Rage": Y/n seems to get an increase of power in rage, and can negate anything thrown at him.

Species: Human(?)

Age: 24
25 (Volume 5)

Backstory: Y/n used to live in New York with his family and Ramona. The two were very close and they inspired each other a lot, during junior high, Y/n got into an argument with his family after Y/n failed a grade. The parents in a rage said that it was better if Ramona was the only one, Y/n took that to heart and packed his things and left without a word. He used Subspace to make it work, he pulled some strings and eventually made a living playing instrument on the streets and people paid. He eventually got a house (threatened the owner to give him one), And lived in Northern Ontario, and he transferred to St. Joel's High School and into Kim's geography class.

Kim and Y/n met each other before Scott met the two. He and her didn't talk until some bullies started to harass him, Kim was about to say something but Y/n smiled and asked them if they felt better. They all were confused until they were about to hit Kim on accident, Y/n grabbed their wrist and got them in a lock. Revealing the Kim that Y/n was holding back a lot, once the bullies left, Y/n wanted to know if Kim was okay but she was gone. Y/n found her escaping and the two got to know each other.

They gained feelings for each other and met Lisa, Scott, and formed the band together. Y/n kept his last name a secret from most, only telling Kim. When Kim and Scott started dating, Y/n was heartbroken but still wanted to be in her life. After Scott moves to Toronto without telling Kim, she was heartbroken and Y/n used Subspace to teach him a lesson. Kim thanked him. Senior year of high school, Y/n was almost found by the police and had to grab his stuff and leave. Kim allowed him to stay in her house. Y/n decides to take Kim to Prom with him, which she obviously refused at first but then accepted. She wasn't feeling it and Y/n tried to get her happy but she kept turning it down.Kim went to get drinks and came back with some dudes bugging Y/n about Kim and Scott, asking him would he pick an apple that's bit or a fresh one. Kim was annoyed but Y/n said he'd pick the one that's most important to him, which Kim was shocked and her heart skipped many beats, and she realized her true feelings for Y/n. She went back to him and pulled him to the dance floor and the two started to have a good time. After the dance, Kim suggested getting out of there, as the two went to a walk in the forest. Kim straight up confessed her feelings then and there and said that she loved Y/n and he made her days a bit less worse, she was blushing trying to sound confident. Y/n also confessed, but wondered they should do now. Kim pulled Y/n in with his scarf and claimed that "you're mine now" and that they would prove it.

After high school, Kim and Y/n attended Nipissing University. After Y/n was once again almost found, Kim made the suggestion of moving to Toronto. And so they moved to Toronto, about a year before the series begins. There they reunited with Scott. Together with Stephen Stills, they formed the band Sex Bob-omb.
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Triva:
* Y/n was born in January 1, same as Ramona

* Y/n likes puppies more than kittens and his favorite movie is Into The Spider Verse

* Y/n's anger was actually not based on the hulk and more based on Gon's transformation from Hunter x Hunter

* Y/n is 5'9

* His favorite band is The Beetles but was then forced to like Panic at the Disco.

* Y/n's hair is Ramona's natural hair color, dark brown.

*Gideon was supposed to appear in every volume to attack Y/n but I figured that would be way too much.

*Before writing Volume 2 on the app, Y/n and Lisa did not date, but it changed after realizing that someone like him would've gotten at least into another relationship. Speaking of which, Lisa actually lied about wanting Scott. She was moving and wanted to break things off because she had no clue what she had to do in order to get her career going, putting her full focus in it. It would've been great to cover with in Volume 4 since the two didn't have much conversations, mostly because she and Scott had a subplot going.

*Originally Y/n was gonna record Kim and Knives kissing and show Kim the video in volume 4. I cut it out since it didn't really make a whole lot of since, but somewhere in another universe/timeline I did.

*Never added it but there was supposed to be a running gag about IHOP. Another one was to never look up at a ceiling fully once your in a building.

*During Volume 5, one draft included Y/n joining Knives' family for dinner and being called Sensei/Shifu.

*Y/n and Kim were never gonna have a big wedding, and it would always be off screen so readers could picture the chaos that followed.