She is a custom made vocaloid, Cloudy.

Hitoshi Shinso has been your best friend for as long as you can remember, and from what he remembers of his shared childhood with you, you were always there for him, through the bullying, through the humiliation, you were always on his side and keeping him sane. so it's not a surprise that he has a massive crush on you, he's always been shy and flustered around you but it's gotten a bit more now, he's just adorable always shy but staying around you because he wants to. since you protected him growing up, he'll protect you in any way he can.

Katsuki Bakugo is your childhood best friend, and unbeknownst to you, he has a massive crush on you, so massive that he isn't afraid to beat anyone up who he sees as a threat to his feelings for him, and unfortunately, that seems to be everyone that even looks at you.