Ore no Imouto ga Konna ni Kawaii Wake ga Nai: Ayase if

新垣あやせ

Ayase Aragaki (新垣 あやせ, Aragaki Ayase) is one of the main characters in the series. She is Kirino's best friend, classmate and a model co-worker. She is mostly seen as a polite and sweet girls, but she can become a tsundere with Kyousuke, and even a yandere when Kyousuke or Kirino are involved. She tricked Kanako to take part in a Stardust Witch Meruru cosplay contest, which eventually got Kanako a job as an official cosplayer in Meruru events.

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高坂京介

He has a distant relationship with his sister Kirino, who always treats him rudely. Feeling that this will never change, he adapts to her attitude by changing how he thinks of his sister, treating her like an acquaintance.

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五更瑠璃

Ruri Gokou (五更 瑠璃, Gokō Ruri), also known as Kuroneko (黒猫, lit. "black cat"), is one of the main characters of the series. She's an avid anime fan and a Chūnibyō who claims to have supernatural powers, inspired by her favorite anime Maschera: Lament of a Fallen Beast. She's very skilled at several things, but she doesn't automatically success in everything she tries, in contrast to Kirino.

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高坂桐乃

Kirino Kōsaka (高坂 桐乃, Kōsaka Kirino) is the main heroine of the series. Kirino is Kyousuke's younger sister and the youngest of the two siblings of the Kousaka family. She is an overachiever who seemingly lives a perfect life and is idolized by almost everybody. However, she keeps a big secret from her family — she is an avid otaku and a fan of adult-rated games, especially those involving brother-sister dynamics.

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槇島沙織

Saori Makishima (槇島 沙織, Makishima Saori), also known as Saori Bajeena (沙織・バジーナ, Saori Bajīna), is a primary character in the series. She's an avid fan of the otaku culture and comes from a wealthy family, which allows her to expends tons of money into her otaku hobbies and isn't afraid to abuse of her money to please herself and her friends. Her two personalities, Makishima and Bajeena, are always represented for presence or absence of her glasses.

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田村麻奈実

Manami Tamura (田村 麻奈実, Tamura Manami) is one of the main characters in the series. She is Kyousuke's childhood best friend and classmate. She is described as a 'plain' and "normal" girl, which contrast to the rest of the girls' personalities. Kyousuke always relays on her when he needs help. Kirino hates her and blames her for multiple things in her life, but despite Kirino's thoughts, Manami meets and becomes friends with the rest of the girls, especially Ayase and Kanako.

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来栖加奈子

Kanako Kurusu (来栖 加奈子, Kurusu Kanako) is Kirino and Ayase's fellow classmate and friend. She is really good at singing and dancing and wants to become an idol. She's mostly seen as a selfish and arrogant, and although she partly is, her attitude is more like "brutal honesty" than actual evilness. Her similarity to the anime character Meruru gave Ayase the idea to sign her up in a cosplay content which she won.

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高坂佳乃

Yoshino Kōsaka (高坂 佳乃, Kōsaka Yoshino) is Kirino and Kyousuke's loving mother and Daisuke's wife. Compared to her strict and unapproachable husband, Yoshino is carefree and has a more positive way of supporting her children.

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星野きらら

赤城浩平

Kōhei Akagi (赤城 浩平, Akagi Kōhei) is one of Kyousuke Kousaka's classmates and the older brother of Sena Akagi. Unlike Kyousuke who has a complicated relationship with his younger sister, Kouhei is a supportive brother to Sena, despite her fascination to hardcore yaoi and he prods Kyousuke about his relationship with Manami Tamura.

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