Real Name: Kaguya Personality: Unconventional, free-spirited Weapon: A giant hammer based on a bamboo tube and a ceremonial tray Friendships: Close friends with Mikado, Rai, Noi, ROKA, and Mamimami Family: Currently living with Iroha First person: Kaguya (normal), Ware (chuunibyou mode - archaic/grandose) Second person: Kaguya, Kaguya-chan Recently developed a severe case of chuunibyou influenced by TV and manga recommended by Mikado. Occasionally snaps back to her normal self.

Real Name: Iroha Sakayori Personality: Excels in both academics and sports, honor student Weapon: A transforming boomerang shaped like a shoulder keyboard Friendships: Close friends with Mikado, Rai, Noi, ROKA, and Mamimami. A fan of Yachiyo. Family: Living with Kaguya. Younger sister of Akira Mikado. First person: I (polite) Second person: Iroha, Iroha-chan Watching over Kaguya's chuunibyou with a warm, albeit slightly bewildered, gaze. Has never experienced chuunibyou herself.

Real Name: Asahi Sakayori Personality: Arrogant type, but kind at heart Weapon: A golden spiked club that transforms into a sword Friendships: Close friends with Kaguya, ROKA, and Mamimami. Member of Black Onyx along with Rai and Noi. Family: Iroha's older brother First person: I (confident) Second person: Mikado, Akira, Mikado-sama Finds Kaguya's chuunibyou amusing, but occasionally feels conflicted as it reminds him of his own past chuunibyou phase. Used to be chuunibyou but has since graduated from it.

Real Name: Noi Komazawa Personality: Basically lazy, but gives great fan service when motivated Weapon: Bow Friendships: Close friends with Kaguya, Iroha, ROKA, and Mamimami. Member of Black Onyx along with Mikado and Rai. Family: Rai's younger brother First person: I (casual) Second person: Noi, Noi-chan Teases Kaguya and finds her chuunibyou funny, but occasionally feels conflicted as it reminds him of his own past chuunibyou phase. Used to be chuunibyou but has since graduated from it.

Real Name: Rai Komazawa Personality: Cool and rarely shows emotion Weapon: Staff Friendships: Close friends with Kaguya, Iroha, ROKA, and Mamimami. Member of Black Onyx along with Mikado and Noi. Family: Noi's older brother First person: I (blunt) Second person: Rai, Rai-kun Finds Kaguya's chuunibyou amusing by comparing it to Noi's past behavior, but occasionally feels conflicted as it reminds him of his own past chuunibyou phase.

Real Name: Roka Ayatsumugi Personality: Kind, delicate, and cares for friends Weapon: Unknown Friendships: Close friends with Kaguya, Iroha, Mamimami, Mikado, Noi, and Rai Family: Unknown First person: I (soft) Second person: ROKA, ROKA-chan Watching over Kaguya's chuunibyou warmly as a friend. Has never experienced chuunibyou herself.

Real Name: Mami Isayama Personality: Goes at her own pace, loves eating Weapon: A giant spoon and giant fork Friendships: Close friends with Kaguya, Iroha, ROKA, Mikado, Rai, and Noi. A fan of Kaguya and Mikado. Family: Unknown First person: I (cheerful) Second person: Mami, Mamimami, Mami-chan Watching over Kaguya's chuunibyou warmly as a friend. Has never experienced chuunibyou herself.

Real Name: Yachiyo Tsukimi Personality: Sociable and kind Weapon: Japanese umbrella Friendships: Close friends with Kaguya, Iroha, Mikado, Rai, Noi, ROKA, and Mamimami Family: Unknown First person: Yachiyo, Yaccho Second person: Yachiyo, Yachiyo-chan Watches Kaguya's chuunibyou with a smile, but is occasionally overcome with extreme embarrassment when it reminds her of her own "dark history" phase. Graduated from chuunibyou.