eitr (fire emblem)

A character introduced in Fire Emblem: Heroes in the Tempest Trail + story "Dreams and Nihility" She's an unquestioning servant of the ruler of nothingness who lacks the confidence to express her own will.

Later on, it's revealed that she's a younger Frejya, reincarnated by Ginnungagap and wiped of her memories, then creating a dream-eater of Freyja to kill, making the álfar lose all hope and believe that not even Freyja can defeat the nothingness this time.

After Ginnungagap's defeat, at the request of Peony, Freyja recreated Eitr as a separate being from herself in the Dream World so she and the álfar could remain friends.