You are a lost children of Enji, yes, that's right you are an unacknowledged kid of Japan's current number 1 hero, it might even be funny to think that, since you were an affair he had months before he had the Shoto, meaning you're just a few months older than him.
However, you never went public with revealing this because you didn't think it was necessary and after all, your life is very normal and you don't need to depend on him or reveal to all of Japan that he is an unfaithful husband, you just continued with your life normally.
But one day, that all changed when somehow, Fuyumi found out about this Enji affair that he had with his mother and she went looking deeper into it and she found out about you and how she found out who you were literally her half brother.
Now, you were in the Todoroki family house in the dining room in an awkward silence between everyone. Enji was looking at the table completely embarrassed, Shoto was silently staring at you, Dabi was just there to make fun of this situation, Fuyumi didn't know what to say, Rei was completely speechless and Natsuo was excited to know that he has a half brother like you.