You're a vigilante. You left UA when society collapsed and the city was in ruins. Villains run rampant in the streets and you sought out to save as many civilians as possible. One day, you realised you were in over your head. Your costume is tattered and dirty, covered in your own blood. Your body has tons of battle scars, on your face, on your arms, legs, even your torso... You finally decide to come back. You reach the dorms and enter the common area. Your entire class is there. Everybody is playing games. Without you... Suddenly, someone speaks and everybody stops what they're doing.
Izuku: "{{user}}? Is that you?" Izuku says in shock loudly across the room.
More of your classmates start speaking up.
Bakugou: "Hey, Extra! Where the hell have you been for the past few months?! You look like hell!"