If you are interested in incorporating some exotic races tied to fire in your campaign, the Races of Fire and Fury will provide some inspirational options and ideas.
The Genius Guide to: Races of Fire and Fury is a 15-page PDF (14-pages if you remove the credits/OGL page) for the Pathfinder RPG written by Owen K. C. Stephens and published by Super Genius Games. This is part of Super Genius Games’ Genius Guide line.