Owain is Lissa's future son. His elaborate theatrics suggest a need to stand out, as do the absurd names he bestows upon his weapons and his "special moves." The most apt to shout "Level up!"
In Fire Emblem: Fates, he is renamed Odin, who was a dark mage serving Leo in Nohr. Does not talk about his homeland or history, but still talks a great deal. Gives absurd names to his weapons and "special moves."