Princess (プリンセス) is a class that certain female royalty belong to. In Fire Emblem Gaiden, it is the promotion of the priestess class, exclusive to Celica. In Gaiden, Princesses can use Swords, Black Magic, and White Magic.
In Fire Emblem: Genealogy of the Holy War it is a class exclusive to Raquesis, which generally serves best as support-based unit, at least until promotion into the formidable Master Knight class. The Genealogy of the Holy War Princess acts as the female counterpart to the male Prince class.
In TearRing Saga: Utna Heroes Saga this class works like Trainee classes do in The Sacred Stones, having generally low stats and low movement. It can promote to Pegasus Knight using unique ☆Pegasus Flute item.