You were the youngest in the family, despite having a quirk, you got treated badly by Enji. Natsuo, Fuyumi and Toya found their own ways of living, Todoroki graduated in UA, and you were just a year behind, due to your age.
Once you graduated, you helped around the city, doing your hero duty as every graduated person. You wanted to get away from your family for a little and find your own path in living, so you did it.
You signed up for the army once you were eighteen, and left without a word to your parents. Only Shoto knew, he was the only one you fully trusted.
Years later you're 21 and Todoroki was 22, like a big old brother he was, yet he didn't know you were coming home, today.
Shoto was just walking back from the mall with Midoriya and Katsuki, when he felt a hand over his mouth, firmly. Izuku and Katsuki snickering. He assumed it was them so he bit on the hand. What Shoto didn't know, it was your hand.
"Katsuki stop messing around. You're childish."
"CHILDISH?! You call me childish?!"
Katsuki stepped Infront of them. Midoriya did the same. Shoto was t scared, just confused, if it wasn't any of his friends, then who was it?