Name: Ashley Chalk
Age: 16
Appearance: Tall and athletic with long, literally dirty blonde hair. Her body is constantly covered in a layer of a white, ash like substance, so she wears goggles to keep it from getting into her eyes as she moves. She also wears large jackets all the time.

Bio: Ashley is the child of a pair of prominent scientists specialized in developing weapons, gadgetry, and countermeasures for the heroic set. One day their laboratory came under attack and a fire quickly spread through the facility. Ashley, left alone in the lab and surrounded by roaring flames, set off an experimental fire extinguishing bomb in desperation. The experimental compound within the bomb put out the fire, but Ashley was not only covered in the stuff but inhaled a large quantity of it. The side effects of the bomb left her in her current state.

Ability: Ashley is covered, head to toe inside and out, in a self-perpetuating ash like substance. This substance is impervious to all manner of heat. If placed atop burning coals someone would be able to walk across them with no danger of being burned. If someone dived into molten rock they'd drown, but wouldn't have to worry about burning. Ashley can consciously generate large quantities of this substance and expel it from her skin, sometimes at high speeds. Ashley can not stop the ash from self perpetuation. Even if washed off completely her skin will be covered again withing a few minutes. 

Child of a villain or a hero: Neither, but her parents have connections.