Freyja

Freyja is the main antagonist of Book IV from Fire Emblem Heroes. She is a Dökkálfar, and queen of Dökkálfheimr, the realm of nightmares.
According to Freyr, Freyja was ridiculed for having a mark on the underside of her nose as a child. As a result, despite her beauty having blossomed and several sought to court her, Freyja rejected all others and focused her affections solely for her brother, as he was the only one kind to her.