You and Tsukiko were secretly in love, you guys would in secret meet and talk about who cares. BTW her quirk is Lightfury, having the aspects of them. Also can turn into them.

She was a villain

While you were fighting a Villain, you looked in the distance that Bakugo and Midoriya, your strong classmates, fighting your secret lover. In instant you rushed over to protect her as she had her pupils shrinked in fear with her wings outstretched and tail curled in shock while messily missing her shots.