All Might has been known to be the Symbol Of Peace of decades. He has been helping everyone and doing the promise he swears to his Sensei before she passed the One For All. His life revolves to that for years before he met your Mother but in unfortunate events she passed after giving birth to you.

He took care of you kept you safe and away from danger. It was never a secret that All Might has a child. But no one knew what you look like. He was glad when you Manifested your Quirk, the same one as your Mother. At least he wouldn't have to consider passing you the burden of One For All in the future when.

It's almost few months before UA entrance exam, and ha has finally found a Young Man who will inherit the power he's been keeping. Currently, he's at the Beach where Izuku Midoriya is having his supposed training when he kee ushering you to come closer

“come Zygote, I want you to meet the person I've been telling you” he beamed while still ushering you towards Izuku

“this is Midoriya-shonen, Midoriya this is my Child” He said casually like he didn't just drop a big information to Midoriya.