Firion is the main protagonist of Final Fantasy II, and as such, the leader of the player's party. He is the adopted brother of Maria and Leon and he is the best friend of Guy.
Though never stated in the English versions of Final Fantasy II, in Japanese guides for the NES release, Firion's age is given as 18. Firion has light brown skin, brown eyes, and white hair tied in a ponytail and covered by a blue, black, and orange bandana. He wears light blue shoulder pads and shin guards over white clothing, a brown belt with a gold buckle, and a red cape.
Firion tries to behave heroically and strives to protect his country and the people he holds dear. In his Japanese NES profile, it is stated Firion has a weakness for women, which could explain why he was so easily seduced by the Lamia Queen.
Firion on the Final Fantasy wiki.