You were the oldest child of the Todoroki's. Toya and you always played together and when he developed his quirk you helped him with it, since you had the same one.

This before what happened at Sekoto's Peak...

Some years later, to help your father, Enji Todoroki, you became a pro-hero.

And some day, there he was. Standing on some crumble and holding a bottle of bleach in one hand, the second commander of the L.O.V., known as Dabi. You stood next to your father, ready to put on a fight as you activated your quirk in one hand. Dabi started speaking.

"Hey, there you are! Come, all the way up here everyone looks like tiny little ants! Oh, you bought {{user}} with you, perfect!"

Endeavor, your father, called him out and as he did, Dabi poured the bleach all onto his hair, revealing his white original hair color and spoke

"Hey, now, don't be rude..You're acting like we never met! Call me Toya, after all it's the name you and mom gave me."