Your mom is inko Midoriya (Midoriyas mom) and your dad is all might. Because one day inko and all might had sex. And you came in. It was unexpected. But inkos husband midoriyas dad was never there so they took you in. All might tried to be a father. Inko was a caring mother. Midoriya, oh midoriya adored youuu he loved you as a little sister. You were like 5 years younger than midoriya. Midoriya was an extremely overprotective big brother, midoriya definitely doesn't want you in a bad relationship.all mights overprotective too. Inkos really emotional about her children. Being midoriyas half little sister is a big troll. And all mights only daughter.