Seth

Seth is General of the Knights of Renais, the elite cavalry force of the Renais Kingdom. Following the brutal invasion by the overwhelming forces of the Grado Empire, he, on Fado's orders, flees from the country in order to protect Princess Eirika, by conducting her to safety at the Kingdom of Frelia. He serves as protector and advisor to Eirika and Ephraim. He is also the man who Fado entrusted the secret of the bracelets to.

He is a very dedicated knight; the fact that he faces the fierce General Valter and continued to follow his orders shows how skilled and devoted he was to his country. Seth is also concerned with the situations of others and watches over the welfare of everyone.

(Source: Fire Emblem Wiki)