http://fireemblem.wikia.com/wiki/Owain
Owain is the son of Lissa and the cousin of Lucina from the future. Owain's supports and conversations with Laurent during the Hot-Spring Scramblereveal that he is a bit of a writer, and always tries to write other characters into his stories the way he sees fit. 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. However, this is revealed to be merely for dramatic effect, and he admits in the Hot-Spring Scramble that he actually does not have uncontrollable power. He is part of the Justice Cabal along with Cynthiaand Morgan.