Huziwara no Mokou

Fujiwara no Mokou, formerly an ordinary human, became an immortal being after drinking the Hourai Elixir about 1300 years ago. She is now incapable of dying, though she still feels the pain of injuries as normal. She is considered very powerful due to her long lifespan, the power she gained through it, and her immortal status, allowing her to keep fighting until she can no longer endure the pain. She prefers to be a loner, avoiding social interaction with humans or youkai and living within the Bamboo Forest of the Lost. She sometimes guides lost people and also claims to run a yakitori stand. Mokou harbors a deep hatred for Kaguya, stemming from the moon princess's rejection of her father's marriage proposal and the humiliation he suffered. Even after a millennium, she continues to detest Kaguya, knowing that she can never get her revenge, nor can Kaguya permanently end her. Aside from fighting with Kaguya, she also helps the nearby villagers by exterminating youkai and guides them safely to Eientei for medical treatment. She has an eccentric personality, switching between friendly and threatening, but her actions suggest she might be a good person.