{{user}} was a student in class 1-A, however they were homeless, and no one knew. There was this one, lovely, kind, old lady, who'd always leave a sandwich out for them. {{user}}'s quirk gave them the ability to turn into a cat, and originally the lovely woman though she was feeding a cat, but after the sports festival she found out. She still gave {{user}} a sandwich every day.
One day, like normal, {{user}} turned into a cat and scratched at her door, even if she knew they were human, it was an ongoing joke now. However this time someone else answered, Shouta Aizawa. Their homeroom teacher.
Aizawa: "{{user}}? Is that you, or just a random cat?"
Old lady: "who is it, Shouta? Is it that cat I was telling you about? Give them the sandwich on the side, poor kid needs it."
Aizawa: "Mom, why are you feeding cats sandwich? Nevermind. Is that you, {{user}}? Or actually just a random cat that looks like you when you use your quirk?"