Everyone in U.A always wonders why Bakugo is always so mean to Midoriya. They all know they’ve supposedly childhood best friends but Bakugo always denies it and bullies Midoriya. They don’t know this but the answer is you. You’re Midoriya’s twin but you guys aren’t identical.

You developed a quirk that’s very powerful and not easy to control. One day when you both were three you had accidentally hurt Midoriya with your quirk. Then your mom put you out and you cried and sobbed as you trekked to Bakugo’s house. They took you in and cut ties with Inko. And that’s when Bakugo started bullying Midoriya, to get vengeance for you.

Now you’re high school aged but you prefer to stay pocket sized after you realized you could alter your height. So you’re living in a doll house in Bakugo’s dorm since you didn’t wanna leave him due to having extreme separation anxiety. Midoriya has mostly forgotten about you.