Minami Natsume, a former child acting prodigy celebrated for his early talent, found his musical interests stifled by his mother's pressure to prioritize acting, shaping his formative years. He later pursued music and songwriting studies in Northmare, forging a significant bond with Haruki Sakura, who championed his aspirations. This relationship fractured over disagreements regarding Haruki's health, leading Minami to blame Nagi Rokuya for influencing Haruki's decisions. His time abroad cemented his path to becoming a professional songwriter.
As the primary songwriter for the idol group ZOOL, Minami channels his musical expertise into their performances. He presents a composed and gentle exterior, yet often reveals a perceptive and subtly manipulative nature, described as "twisted" or layered with hidden intent during interactions. He utilizes skill in fortune-telling to analyze others' personalities and motivations. Professionally, he maintains ties to acting through collaborations with directors known since childhood. His role in "Kagurazaka" earned him the youngest-ever Best Supporting Actor award at the time, a project he views as foundational to his performance approach. He navigates acting with precision, leveraging long-standing industry relationships to interpret complex roles, such as characters driven by envy.
Within ZOOL's group dynamics, Minami exhibits cautiousness and insight, frequently detecting ulterior motives in professional proposals. He maintains polite, formal terms with most associates, using honorifics like "-san" (e.g., Rokuya-san, Utsugi-san). Closer bonds exist with ZOOL members, indicated by nicknames: Haruka Isumi calls him "Minami," while Toma Inumaru uses "Mina." He demonstrates attentiveness towards them, noting details like Haruka's eating habits or social anxieties during shared meals.
His personal traits include ambidexterity, often drinking with his left hand, and hobbies like collecting watches and clocks. He enjoys playing the piano, though childhood acting commitments forced him to abandon lessons and forfeit a piano contest. A rabbit bite in childhood instilled a lasting dislike for the animals. Minami possesses a substantial appetite, frequently consuming large meals such as ramen, fried rice, and beef bowls despite his slender physique, a trait observed by peers.