Cthuko /Kūko is a main character in the non-yuri series "Haiyoru! Nyaruko-san!". An ancient alien, who is obsessed with otaku culture and video games.She possesses the power of Flames, and is also able to control Space CQC turrets at will.
- Ever since kindergarten she loved Nyaruko so much.
- She transfers to Mahiro's school and takes the name Kūko Yasaka, Nyaruko's "wife", for their newlywed life will finally start at episode 3 of the first season.
- Nyaruko and she were once on somewhat hostile terms, what with Nyaruko loving Mahiro over Kuuko. This led to the initial attempt and desire to kill him.
- In the second episode of the first season, she took Nyaruko to bed, in order to embrace her sexually with adults eyes only to make babies.
- No one will touch the Crawling Chaos without her permission.
- Nodens Dimension is the name of the place she wanted Nyaruko to never leave it, to never escape from her.
- To come with Nyaruko to the end of the Milky Way is her biggest demand.
- After she knew about Nyaruko's boyfriend, she became angry with fury to kill that boy, to burn him until nothing remains, and vaporizes his very soul, she will end it all.
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