Tsubaki (Inuyasha)

Tsubaki is a villain in Inuyasha and was once the rival of Kikyo, seeing as she was the only one who matched her with power. As a dark priestess, Tsubaki makes deals with demons, and made one such deal for eternal youth at some point. Even as she aged, she was able to maintain a youthful appearance under her elderly disguise.

Backstory
Tsubaki was a powerful priestess who rivaled even Kikyo in power, and was well-respected before her turn towards darkness. One day, Tsubaki cursed Kikyo, saying that she must abandon human feelings to retain her power, and that if she falls in love with a man she would die a horrible death. Kikyo knew she was cursed, but wasn't concerned, and scoffed at the idea of love. Tsubaki wished for the Sacred Jewel to retain her youth for fear of fading beauty, which is why the jewel was entrusted to Kikyo.

Soon after, Kikyo began to fall for Inuyasha, and Tsubaki desired the jewel for her wish to be granted, so she arranged to curse and kill her rival using her familiar, a Shikigami. Unfortunately for her, Kikyo fired the curse back upon its caster, giving her a scar on her right eye making Tsubaki vow revenge on her rival. As it turned out, the dark priestess was correct, and KIkyo died a violent death at the hands of (inadvertently) Naraku. Even 50 years later, Tsubaki's hatred for her held, and Nar