Cthuko is an alien of a different species and Nyaruko's childhood friend from kindergarten and elementary school. Rather than viewing Nyaruko as an enemy—since their species are hostile to one another—she loves her deeply. Kuko is typically quiet and blushes frequently. Nyaruko refers to her as "NEET" because of her passion for games.
Spoiler
Later in the 2nd season she starts to like Mahiro more after he played along with her with the fact that she is engaged to him (so she won't marry her cousin).
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