Game Debut: Fire Emblem: Awakening
Smash Debut: Super Smash Bros 4 (Hidden Character)
Summary of Lucina (The Fire Emblem Wiki):Lucina is the daughter of Chrom from the future and has the mark of Naga, known as the Brand of the Exalt, on her left eye. She is a kind and determined princess with a strong sense of justice, who believes that saving the world is her mission. She loves her father dearly and is always worrying over him. Her sword, the Parallel Falchion, was originally thought to be a separate weapon from Chrom’s Falchion, but was later revealed to be a version of the same weapon brought back from the future.
After Chrom’s death at the hands of the Grima-possessed Avatar, Lucina inherited the Falchion and attempted to fight Grima alongside the other children then, though they were all heavily outmatched. In time, Lucina and the other children, in an attempt to prevent this future from passing, were guided by Naga through the Outrealm Gate to a time before the war, Chrom’s death, and Grima’s resurrection. She donned a mask she received from Gerome to hide the Brand of the Exalt and traveled to the past, though was followed by Grima, attempting to stop her.