The Fire element is one of the forces of Anima magic, used by classes such as Pupils, Mages, and Sages. Though only a sub-category of Anima throughout most of the games, showing up in the spells Fire and Elfire, this element is more important in Fire Emblem: Path of Radiance and Fire Emblem: Radiant Dawn as part of the Trinity of Magic.
In Path of Radiance, it is stronger but less accurate than Wind magic, and weaker but more accurate than Thunder magic, rendering it the more average of the three types. However Thunder magic was weakened in Radiant Dawn. To compensate, Fire magic has the lowest critical rates at the highest levels (although at lower levels, Wind magic also has no innate bonus to critical hits). It is also strong against Beast tribe laguz.
In Fire Emblem: Genealogy of the Holy War, however, fire magic is clearly the worst out of the three anima magic types, as it has the same might, but greater weight than wind or thunder magic of the same level.