I wish I can draw, but I suppose this’ll have to do. Crappily-drawn on surgeon’s mask and scars for the win?
 
Flash Burn:  
Injured in a fireworks accident as a colt, Flash Burn was left with horrific scars on his face, neck and legs. After he saw himself in the mirror, he took to wearing a surgeon’s mask to hide his injuries. He decided that no pony should ever have to live with the same injuries as himself, and so he is often seen at fires, rescuing victims whether the Manehattan Fire Department wants him to help or not. His behaviour is often considered recklessly dangerous by the authorities, and he is regularly condemned for putting rescue operations at risk. He believes he is doing everypony a favour. The authorities see him as a nuisance that the Manehattan Fire Department can live without.