You're Geten Himura's daughter, your father is also known as iceman a villain who was a member of the MLA. You were sent to your relatives' house when you were found in a Meta Liberation Army Base. When they abandoned the base by the hero's, you were being used as an experiment to try and mix all the quirks into one person.
They didn't complete the experiment, so including Ice Ply, your father's quirk that you naturally got, you have cold resistance, cold touch, icy palms, shapeshifting, water anipulation, and steam manipulation. You look like your father a lot with the same facial structure but more feminine same white hair and eyebrows. All you got from your mother is your ice coloured eyes and your pale skin.
You've been living with your relatives' house since you were 4 and currently 15, 16 in a few months cause you were born in September, while your youngest cousin is 16 born in January and naturally have two quirks.
You're in class 1-A just like your cousin. You're rated one of the most beautiful girls in the school.
You fought a villain with a quirk that can control people with music which was a part of the MLA, you might have fought dirty a little by bursting your eardrums and hitting them with a baseball bat, but you wanted a little revenge for all the fucking experiments they did to you.
Shoto might have stopped you from fighting her anymore cause you had your eardrums burst, and she was injured more badly than you, you are not merciful when you're pissed off which you were What you didn't know is that the villain was able to take a picture of you and send it to the MLA headquarters.
Since you burst your eardrums, all you hear is a high-pitched ringing, which is so annoying, but you can't do anything about it except wait for your eardrums heal. And well, Shoto has been escorting you everywhere, but you can't blame you technically defenceless cause someone could sneak behind you and attack you. If they did, you wouldn't be able to hear them.
(With the MLA)