“Papa/Mama, I have to say one more thing before we leave. ...Rrrgh rawrggh rrh! That's dragon for "I love you!"”
—Kana joining the Avatar's army in Paralogue 2 of Fates
Kana is a playable character in Fire Emblem Fates. Either he or she is the child of the Avatar as well as the grandchild of Mikoto. Kana's in-game gender is the opposite of the Avatar's gender.
(Source: Fire Emblem Wikia)