Oreimo

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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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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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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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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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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メルル

Meruru (メルル, Meruru) is the magical girl main protagonist and the titular character of Kirino's favorite anime, Stardust☆Witch Meruru. Her alter-ego is Meru Akaboshi (赤星める, Akaboshi Meru), a grade four student. Meruru has a magical wand that can turn into various things. Her seiyū in the series is Kurara Hoshino.

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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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高坂大介

Known to Kyousuke as a man with the appearance of a Yakuza member and the aura of a gorilla, Daisuke is a middle-aged man with tanned skin, swept-back hair and a face with well-defined features. He also sports a menacing glare behind the frameless eyeglasses he wears. When at home, he is always dressed in a traditional Japanese yukata and is occasionally seen drinking sake, especially to calm himself down in a tense situation.

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田村いわお

Iwao Tamura (田村 いわお Tamura Iwao) is Manami's little brother, whose attempts to follow the cool trends often backfire on him. He sports a buzzcut having been convinced he was getting a skinhead look. He has a fantasy of being a rock star, which was made fun by his grandfather.

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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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