Fire is a Soul Demon. Much like Light, Metal etc. It moves through this relm and many others. In our relm we can easily control it at will if it has chosen us. But in the otherworld... it can persuade us.
Fire is heavy minded but agressive. People of the flame usually jump head first into rough situations. They live in the now and worry about the consiquences later. Fire creatures are those of power and low intelligence eg. imp, lion, tiger.