Tales of Tolgard
A pyromancer is usually an arcane spellcaster who specializes in the evocation school and selects fire as a chosen element when pursuing specialized prestige classes like elemental savant. A pyromancer also tends to have an unnatural obsession with burning things, that is also usually pretty apparent from their outward appearances.
Pyromancers who take their craft seriously are usually a force to be reckoned with. They go out of their way to learn new spells that can utilize their chosen element. More fanatical pyromancers are too busy burning things to focus their efforts towards improving themselves.