Mutsu-kabe Hill Yokai

Mutsukabezaka is a character who only appeared in the one-shot Thus Spoke Rohan Kishibe - Mutsukabezaka

Appearance/Personality
Mutsukabezaka is a evil creature. It posses people and makes them suffer with the feeling of losing someone just because it feels happy. It also makes humans do everything when possessing them, so the yokai doesn't need any responsibility. It also holds the characteristic of bleeding forever after dying, no matter what its done to stop it.

History
According to Rohan Kishibe's research, Mutsukabezaka is a Yokai from possibly thousands of years ago. Ever since then he has been possessing people's love and the weakness of their heart, making humans do all the work while not having any labor or responsibility themselfs. Its only purpose is leaving descendants. The peak of happiness for this creature is when they die in front of somebody, at which point they soon posses the witness. The few Mutsukabezaka's yokais left on Earth are somewhere, dying in front of someone. Kamafusa Gunpei was possessed by one Mutsukabezaka, who died in front of his lover and impregnated her with its descendants.

Thus Spoke Rohan Kishibe - Mutsukabezaka
After learning about Kamafusa Gunpei's story, Rohan investigates the region around Osato Naoko's house to discover his goal, suspecting him to be a yokai. Rohan  he comes across a young girl. She tells Rohan she's not allowed to talk to strangers and runs away. Rohan tries to catch her, but that makes the girl fall and hit her head on a rock, bleeding just like Gunpei. Rohan realizes this girl is actually Osato's daughter with Kamafusa, surprised the man who became a corpse was able to impregnate Osato while being dead. Rohan soon realizes the girl is possessed by a yokai who is trying to posses him and uses Heaven's Door to write one last memory before all her memories fade away and she dies: "I don't know Rohan Kishibe. Even if I meet him, I won't see him". When the girl comes back she briefly shows her true form to Rohan, but leaves after not seeing him. Rohan comments that one second late and he would have been possessed or exterminated by the yokai, who he names Mutsukabezaka, and declares his research complete.