HERE'S THE REST OF THE INFO
She is manipulative, intelligent, hates perverts, maniacal in some cases, seemingly sweet and innocent, compassionate, and caring towards her "family ". She does not understand justice or morals, but only sees that she doesn't share the same opinion with others.
At the age of four she was taken in by AFO by Shigaraki's request shortly after Izuku left, convinced that Shigaraki was her older brother. Commonly having nightmares resulting in the discovery of her genetic quirk and Shigaraki's developed soft spot for her, this lessened his childlike tendencies (tantrums). She believes Toga to be her older sister, to Shigaraki's displeasure. She learned how to defend herself from others and all of the body's weak points from a young age, courtesy of Toga.
I think that if she were born with the same eye condition I have that causes my tear ducts to randomly act up, her second quirk will be much more useful.(basically I cry at random times without feeling any strong emotion, sometimes I dont even notice the tears there)
Infiltrating UA by either passing the hero exam or getting in through the sports festival from general studies. The pastel colors of her clothing and seemingly sweet and bubbly personality will starkly contrast the reveal of her true intentions, but she may make some real friends at UA *friendship is one concept she cannot understand while she is in the villains care*. Use this last remark to your/fans' wishes.