Kūko (クー子, also known as Kuuko and Cthuko) is one of the main characters, and an alien who is in love with Nyaruko despite that her race is the archnemesis of Nyarlathotepians, and she appears to be clingy. A female Cthughan (alien from Cthugha). She takes the form of a slender, red-haired girl. She is in love with Nyaruko despite that her race is the archnemesis of Nyarlathotepians, and appears to be clingy. She is hostile toward Mahiro and threatens him to stay away from Nyaruko in the beginning of the story. As the story progress, she becomes more friendly towards him. She transfers to Mahiro's school and takes the name Kūko Yasaka, Nyaruko's "wife". She is also obsessed with otaku culture and video games. Kūko was Nyaruko and Hasuta's space elementary school classmate and appears to at