Kana Minami serves as the middle sister in the Minami family, attending her second year of middle school during "Minami-ke: Omatase." Her personality is lively and impulsive, frequently acting without forethought and prioritizing fun. This fuels her penchant for comedic schemes, often involving acquaintances in elaborate pranks or unconventional activities. While energetic, she displays contrasting laziness during home downtime, favoring relaxation over productive tasks.

Physically, she sports brown hair styled in waist-length twin pigtails, though manga adaptations occasionally depict her with red hair and eyes. Subtle physical development occurs between seasons, including changes in bust and hip measurements. Expressive facial reactions, especially to misunderstandings or surprises, form a recurring visual trait.

Academically, she typically performs poorly due to minimal effort, though rare instances like near-perfect math scores suggest latent capability when motivated. Her culinary skills are notoriously deficient; attempts to "improve" dishes—such as adding juice to pancake mix or chili peppers to bathwater—result in inedible or hazardous outcomes. Basic cooking, like packaged curry, remains manageable without experimentation. Non-academic weaknesses include susceptibility to carsickness, an inability to blow bubblegum bubbles, and consistent losses to her younger sister Chiaki in board or video games.

Her relationships drive much of her character arc. She frequently teases Chiaki, provoking violent reactions or cynical remarks, yet underlying affection surfaces through shared moments and mutual dependence. Kana seeks her sisters' approval and privately resents being perceived as unintelligent, even as she cultivates this image for amusement. With the eldest sister Haruka, she exhibits less overt deference, often teasing her similarly to Chiaki, reflecting their longer shared history before their parents' absence. Among Chiaki’s friends, she adopts a "cool big sis" role, notably manipulating Makoto into cross-dressing. Her connection with Fujioka remains ambiguous; she misinterprets his romantic confessions as threats but regularly invites him home, fostering his closeness with the family.

In "Minami-ke: Omatase," a Halloween segment highlights her traits. She surprises Makoto wearing a vampire costume crafted by Touma, enthusiastically explaining Halloween traditions to his confusion. She orchestrates his dressing as a magical girl and guides him to demand candy from Takeru using "trick or treat," showcasing her characteristic initiative and mischief.

Her development includes increased emotional awareness, demanding explanations for being labeled an idiot while reconciling this with her provocateur role. Moments of vulnerability surface, like jealousy toward peers' physical maturity or distress when sisters criticize her antics. Recurring comedic motifs involve her "Boss" nickname (from T-shirt designs), being mistaken for a beetle under blankets, and schemes backfiring—such as faking a suicide note via sloppy Tanabata wishes.

Broader background notes indicate sensitivity to perceived slights about her physique and disdain for the family benefactor Takeru. Her rhinoceros beetle pet, Vajra Mark II, appears briefly before escaping during a summer-focused storyline. Her name incorporates the kanji for "summer," continuing the sisters' seasonal naming theme.