Owain is the son of Lissa and the cousin of Lucina from the future. He is quite proud of his heroic lineage and bears the Mark of the Exalt on his arm, proving that he and Lissa are of Ylissean Royalty bloodline. Owain has an "uncontrollable sword hand" which apparently seeks battle. Some time after the events of Awakening, Owain, alongside Severa and Inigo, travels in the world of Fates and joins the Nohr army, taking on the alias "Odin Dark". Odin, who performs daily research into "amazing special moves" and still enjoys naming his weapons, becomes a dark mage in service to Leo alongside Niles. If he achieves an S-Support, he will have a daughter named Ophelia. Described as a "colorful" character by Lucina, Owain has a habit of speaking in an overly theatrical fashion that some people find tiresome to deal with. He is somewhat preoccupied with the idea of being a hero and seeks the fabled sword Missiletainn in his quest, unaware that it is not the Mystletainn, but just a normal sword. Always eager to engage others in duels, Owain attributes this to his sword hand craving battle, even though this is, in actuality, due to his desire to prove his mettle and improve his combat skills. He is also known to make innumerable references to past Fire Emblem game titles when naming weapons and moves, as he strongly believes that doing so imbues them with power that transforms them into sentient allies instead of mere tools. Many of his responsive outbursts also hearken to many past Fire Emblem heroes. Despite his tendency for melodramatic flourishes, Owain is known to be able to subdue this tendency and adopt a manner of speech that is considered to be more normal and easier to comprehend. According to his supports with Lucina, he is revealed to be able to understand when situations call for him to tone down his theatrics. In this particular context, he first greets Lucina in a more subdued manner after personally deeming it inappropriate to address members of royalty in his usual style of melodrama. The most hot-blooded member of the army and the most likely to shout "Level up!".