Okoi (Japanese: お胡夷, hiragana: おこい, rōmaji: Okoi) is a character featured in Basilisk: The Kouga Ninja Scrolls. Okoi was chosen to be one of ten ninja to represent her clan of Koga Manjidani against the chosen ten of the rival Iga Tsubagakure clan.
Tomboyish and energetic with a well endowed frame, Okoi (in a manner similar to Rurouni Kenshin's Makimachi Misao, Naruto's Sakura Haruno and Soul Calibur's Taki) represents the popular concept of the kunoichi while Akeginu and Kagerou both embody the more historically traditional version. She shares a deep bond with her older brother Kisaragi Saemon and is one of the few people who can make him smile. In the anime, Okoi also has a strong friendship with the normally unapproachable Kasumi Gyoubu whom she often goes with to hunt wild boar in the forests surrounding Manjidani.
Although a capable fighter, Okoi is not opposed to using her ample assets to lure men into a state of false security if she has to. For once they make the mistake of forming physical contact, Okoi is able to adhere her skin onto her opponent's and then absorb their blood into herself; leaving her enemies as dried up husks. Upon completion, Okoi must then vomit out the excess blood before she can use the technique again. As more contact equals faster blood drain she is dressed in a more revealing manner than the other kunoichi with a hip length sleeveless kimono and shortened hakama that resemble Daisy Dukes.
In the Japanese original anime, she is voiced by Haruka Kimura, and by Monica Rial in the English dub.