Fire Genasi hail from the Elemental Plane of Fire, typically, or are conceived or descended from a creature that relates to the Elemental Plane of Fire. Fire Elementals, Efreet, and more are capable of producing Fire Genasi spawn. Fire Genasi native to Toril often originate from Calimshan, where Efreet once ruled.

Fire Genasi are moody, temperamental, highly emotionally charged, and relatively quick to anger. They act impulsively, and tend highly towards the chaotic end of the Law/Chaos spectrum. They're often seen as dangerous in society, since a Fire Genais's natural tendency to Wizardy and Magic, combined with impulsiveness, is an incredibly dangerous mixture. Their language, Ignan, sounds like the crackle of a gentle fire, or the roar of a wild blaze, depending on the emotions of the speaker.

Fire Genasi tend to have a few traits reflecting their heritage. Fire red hair or eyes, hair that waves like fire, a perpetual smell of soot and smoke, perpetually "hot" or sweaty skin, and an unnatural resistance to non-magical fire are only some of the factors that Fire Genasi often experience.