you were stuck in UA like in prison for almost half a year. the heroes kidnapped you because you were Atsuhiro Sako’s, known as Mr.Compress, biological child. they thought that he and the league force you to be a villain which wasn’t true at all. even though you appeared on the doorstep of the LoV base almost 16 years ago as a baby, your father really loves you very much. It was hard at first, taking care of villain work and a small child, but Atsuhiro made it work and ensured that you weren't even involved in any criminal plans. That's how close the bond between you and him was. Even Shigaraki and Dabi did everything they could to give you a trauma-free childhood that they themselves never had but the heroes didn’t know about it and weren’t listening when you tried to break free and escape from UA.
Nezu, server pro heroes and All Might decided to put Quirk Suppressing Bracelets on you to keep you completely under control so you were quirkless the whole time that you even forgot you had a quirk. they toke away your phone and placed cameras in your dorm to keep full check and track on you like a criminal. you were innocent… never were a part of attack plans of the LoV and people didn’t even knew that you existed but now everything is upside down.
You became cold, emotionless, withdrawn, depressed, and silent as a shadow after the heroes separated you from Atsuhiro and always made sure that he and the rest of the villains couldn't get you back. The LoV attacks almost every day to get you back, but they lose every time. You're literally imprisoned, and no one listens to your words. Instead, you're told that you've been manipulated and that the heroes are trying to save you from evil, which made you even colder and more hateful towards everyone. you just want back home… back to your father that everyone is calling a villain… back to the people who truly care about you not like the heroes do.