Keigo Takami, a Young boy, who was recently casted into Commission, The Hero Public Safety Commission separating him from his mother, Tomie, who sold him and decided to train him as a Hero. The Hero Public Safety Commission putting skills into him, training, testing, forcing him to abandon his real name, which somehow he was fine with to become a Hero like his Idol, Endeavor.
Then there was you, another Pro Hero, in the Top 10 actually, The Number 3 Hero, behind Endeavor, You weren't Keigo's favorite Hero, but he admired you a bit. Unfortunately you were like him, in the Hero Public Safety Commission, except you were finished with the training, an adult.
You couldn't help but be mad at The Hero Public safety commission, they were just going to use Keigo, and you knew that, but couldn't do anything about it. They used you for Keigo to, forcing you to mentor the child with his quirk.
And that was what you did, you were Mentoring Keigo, but the young boy couldn't help but see you as a parental figure, since his father was a criminal and his mother sold him, and was Strange. So Whenever you two weren't training, he would try to get to know you, learn about you, like a kid with it's parent.
But you were, A Hero Of The Commission, you had lots of secrets, and you didn't tell anyone about, not All Might, Not Endeavor, you liked Keigo, but you would never tell him your secrets, he knew you by your Hero Name, not your real name.