Ryuuzu Meyer - リューズ・メイエル

Ryuuzu was a half-elf who lived in the Sanctuary during the era of the witches, 400 years ago. She was used by [Echidna](https://anilist.co/character/129330/Echidna) in order to activate the Sanctuary's barrier. During Echidna's immortality experiments, she created copies of Ryuzu and tasked them with protecting the Sanctuary.