(Remember your borrowing MY stand.)
Stand: A stand is an entity psychically generated by its proprietor, generally referred to as a Stand User (スタンド使い, Sutando Tsukai).[1] It is viewed as a visual manifestation of the User's fighting spirit. A Stand generally presents itself as a figure hovering near the user and possesses abilities beyond that of an ordinary human, which, depending on the Stand User, can be wielded for good or evil.

Quirk: A Quirk (個性, Kosei?, lit. "Individuality") is a special, superhuman ability an individual can possess. Quirks are generally unique to their user, and are classified in multiple categories.
A stand in this case Is the primal and purest form of a quirk. When the first quirk was discovered stands had already been around but were not visible to anyone that didn't have one as quirks became a more common occurrence so did stands, that is till the first villan appeared. It was revealed that stands were the original form of quirks, manifested into its own form with the sole purpose to defend the stand user. The stands were able to have there own lives when not being used, the stands were sentient beings, they had a council where only the strongest and smartest were in charge. Once they found out that quirks were being used for evil they became a physical part of there user, giving them one of there stands abilities. But when the stands dissapeared there were a few Scragalers left behind, those stands which were unable to become quirks were trusted to a family in the U.S. For the last 200 years your family has been the one's to protect and be protected by the last remaining stands. The stands names were. Star Platinum, The World, and Blue on Black. Those three were passed down through generations till finally, they three Landed on your family. Your father possessing Star platinum and your mother The world, leaving you with Blue on Black, who was deemed not ready for combat in the slightest that is till you proved them wrong. Every night after receiving your stand you would train building up Blue on Blacks power, speed and working on anything that would be worth working on. Somehow word spread to Japan about a boy with so much power that he could level buildings with a single glare. Of course that wasn't true, you'd need to work on your stands range with its radiation blast radius. Once you hit 14 you received a card in the mail saying that you were accepted into UA high school. After doing some research on it you decided to go, your mother was hesitant at first but trusted that you could handle it, she contacted one of her friends from Japan who said that you could stay with them if you went. On your 15th birthday you boarded the plane and waved at your parents before leaving them behind. It was about a 1.5 day flight and by the time you arrived in Japan you practically had 3 hours of sleep before you had to train again and meet this family you were staying with. You grabbed your things and after putting three padlocks on each of your bags pockets to make sure no one tried to steal your stuff, you slept on a bench, getting those 3 hours you needed. When you woke up you saw a girl with black hair tied into a ponytail, hazel eyes and a rather mature body. Her name Momo Yaoyorozu.

Momo:"Are you Y/N by any chance?" She asked, her voice sounding almost heavenly, it would have sounded better had you not just woken up and had actually been paying attention.
Y/n:"Wha-what? Sorry I just woke up and I couldn't hear you too well."
Momo:"It's alright. Are you Y/N L/N by any chance?" (Y/n= your name and what you go by the most. L/n= Last name)
Y/n:"Yep that's me. I'm guessing your one of the Yaoyorozu's?"
Momo:"Oh so you know about my family."
Y/n:"Kinda hard not to since I can tell your a rich kid, both of our mother's were best friends and the fact that I've seen your father and mother on TV to the point where I could spot them even if they were surrounded by clones, plus there holding a sogn with my name on it." You said sitting up and pointing towards her parents who were all smiles since they were noticed by you. You fixed your H/l, h/c hair and slung your bag over your shoulder. The two of you walked over to her parents only to see a man with some kind of stretchy limbs quirk try to steal Ms.Yaoyorozu's purse.
Ms.Yaoyorozu:"Gah! Hey get back here theif!"
Criminal:"Hahaha! You can't stop me!" You looked up at the criminal and muttered under your breath making it so only you and Momo manage to hear what you said.
Y/n:"Blue on Black..." Your stand then manifested right in front of the criminal and punched him in the gut leaving a small radioactive burn mark on his clothes. "It's a good thing you didn't get more then 40 meters from me, otherwise I wouldn't of been able to hit you with Blue on Blacks attack. Now." Blue on Black stood over the criminal, who was practically shitting himself, while the Yaoyorozu's just watched shocked, they were able to see your stand since there quirks came from there stands. Blue on Black stood above the man with one hand towards his face, pulsating with radioactive energy.
Y/n and Blue on Black:" Give the purse back to the woman and while your at it don't try anything like that again other wise...." You then threw a pen that you had into your pocket into your stands pulsating gauntlet, atomizing the pen instantly. "Your face will be next." The Criminal dropped the purse and ran away as quickly as he could making sure not to bump into anyone. Blue on Black managed to get rid of the radioactive energy he built up before picking up the purse and giving it back to Ms.Yaoyorozu. All three of them were shocked, blue on black then dissapeared back into your soul as you walked past the now speechless family.
Y/n:"Well are we going home or not. Using my stand like that right after waking up really tires me out and I'd rather not sleep on a bench again." The three noded before heading out and leading you to a limo which you then fell asleep in, trying to make up for all the sleep you missed on the plane. The entire time Momo couldn't take her eyes off of you, she kept thinking back to what you muttered earlier and who or what your stand was.