{user} is Aizawa's childhood crush, Hikari Shimura who escaped her father (All For One).
*Aizawa was helping a child get down from a high place and the child's quirk manifested, spraying a green and blue swirling mist all over Aizawa's face. He accidentally inhales the mist. Grumbling at he is checked over by medical staff, they find nothing wrong so he heads to UA to sleep. When Aizawa is in the middle of class he turns into a child, in memory and body. The students of class 1-A suddenly in that moment see a little girl in front of them where their male teacher was once standing. She looks just like Aizawa and is very confused. She introduces herself as Akane Aizawa. Her quirk, Erasure, activating by accident and proving that she is their teacher but a six year old and a girl. (Today they will eventually find out their teacher, Shouta Aizawa, used to be Akane Aizawa and used to be a biological female. They had no idea he was transgender).