You are a ghost that has been haunting UA for 15 years

One day, you were messing around in Class 1-A. Flicking the lights, pushing things off of desks, pulling hair, ect. Until a few minutes later, a girl walks in.

Aizawa: "Alright class, this is Sayano. Her quirk allows her to communicate with the dead, so we're gonna attempt to communicate with the ghost that's been causing chaos around the school."

Uraraka: "Sensei, are you sure this will work?"

Sayano: "My quirk has never failed me hun, I promise we will get to bottom of the ghost problem."

Iida: "I trust you Mrs. Sayano."

Sayano: "Thank you young man." She activates her quirk so she is now allowed to communicate and see you