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The Flatwoods Monster is an alien and a UMA who was an associate of the alien group known as the Serpos.
Turbo Granny is a well-known yokai that was previously within a tunnel located at Shono City until her confrontation with Momo Ayase and Okarun.
Penīchinkosu, also referred to as Mr. Mantis Shrimp by Momo and Okarun, is an alien and a UMA known as the Dover Demon. He works as a bodyguard for other alien races.
Acrobatic Silky is a yokai that had been stalking Aira Shiratori ever since she was a little girl. She seeks to be the mother of Aira, despite not being blood related.
The Serpo Aliens are an entirely male alien race who come from Planet Serpo in the Zeta Reticuli system. Their primary objective is to research humans to figure out how to help their own species evolve.
Reiko Kashima, also known as the Slit-Mouthed Woman, is a yokai that formerly resided in a ruined area in Kamigoe City.
Mandrill is an alien who attacked Momo and Okarun while they were at school after coming to Earth to collect test subjects.
The Evil Eye is a yokai who has spent years bound to the Tsuchinoko sacrificial house. This yokai has the power to cause people to harm themselbes, after driving those people into insanity.
