Satella

Four centuries ago, she consumed half the known world in shadow, earning the dreaded title of the Witch of Envy. Now bound within the Great Waterfall, this silver-haired half-elf exists in a state of eternal confinement — yet her influence never truly fades. The witch factors dwelling within her give rise to two distinct personas, one of which harbors an all-consuming, otherworldly love for Natsuki Subaru, and it is she who quietly bestowed upon him the power known as Return by Death. In the second season, she emerges within the Sanctuary to confess her feelings directly, leaving Subaru with a haunting plea: that one day, he might be the one to save her.