Rekindling The Ashes

Keiko Todoroki has long abandoned her birth name and started calling herself Vanity, Ember, or "Chesire Cat" depending on who she comes across.

Childhood friends of Deku and Bakugo.

Vanity is the forgotten middle child between Dabi and Shoto, whose fire Quirk rivals that of Dabi's Quirk after he grows up and joins LoV, only now she struggles to control her Quirk due to a traumatic childhood secret. Endeavor, having always been power hungry, agrees to allow a man wearing a black trench coat to try and work with her to make her Quirk even stronger, unaware of the horrors that went on behind his back. Her family was later told she had died in an accident, and Endeavor didn't think any thing of it despite the grief.

Everyone eventually moved on, while they secretly continued their expirements for ten years or so.

She'd escaped the facility and found a tree house to live in, wanting to just live her life and be left alone by both heroes and villains.