Seliph
The protagonist of the second half of Fire Emblem: Genealogy of the Holy War, wanting to avenge his father Sigurd after his untimely death. Originally called Celice, Seliph works with his dead father's allies to save Jugdral from the Loptyr cult.
Oh yeah, Lord Seliph is raising a rebellion party alongside Shannon! I'll fight by their side, no matter what!