Natsume Sakasaki has striking red hair with an asymmetrical cut; a long, white-streaked section falls to his shoulder while the rest remains shorter. Golden eyes accentuate his average height and build. He typically wears his school uniform without a tie, layered over a black shirt, and sports a long necklace with a pentagram symbol. He previously favored a white lab coat over the standard blazer. The son of a renowned fortune teller, Natsume practices fortune telling alongside his idol career. His speech patterns deliberately end sentences in katakana as a "good luck charm" to create auditory discomfort. When expressing unfiltered emotions or "casting a spell," a distinct font and distortion transforms his words. He cultivates a mysterious, enigmatic public persona with cryptic phrases, yet exhibits diligence in work and experimental pursuits aimed at realizing his ideals. As leader of the unit Switch, he seeks innovative stage directions to merge with his fortune-telling. Vocally, his performances blend sweetly mischievous tones with sharp execution and sophisticated presentation. In childhood, he attended an idol training school after his mother resolved financial troubles for Tsumugi Aoba's family, accepting admission as payment; Tsumugi noted his talent then. An old tradition required him to crossdress to protect boys with weak constitutions, a topic he finds unpleasant. He occasionally encountered Sora Harukawa in their youth, sensing an unspoken connection despite no formal meeting. As a first-year at Yumenosaki Academy, he isolated himself in the Underground Library's Secret Room to hone his fortune-telling and magical skills. He became one of the Five Eccentrics but, as the youngest, was shielded from their worst actions during the conflict with "fine." Initially resenting the other Eccentrics, perceiving his own ordinariness against their talents, he sarcastically called them "niisans" (older brothers). Shared summer experiences fostered genuine camaraderie. He devised a plan to counter "fine," but after Wataru Hibiki rejected it, he blamed himself for failing to aid them. Unbeknownst to him, elements of his strategy were later adapted by Trickstar. This failure fueled anger and a desire for revenge, driven by protecting his seniors and proving his own capabilities. Post-conflict, he adopted a colder demeanor, particularly toward Tsumugi due to their shared past and Tsumugi's association with Eichi Tenshouin. He rarely attended classes, citing advanced self-study and a preference for unrestricted time, instead frequenting the Secret Room for experiments or sleep. Concurrently, he appeared on television as a substitute fortune teller for his mother. Despite self-identifying as a liar and masking intentions, his underlying motivations often involve kindness. He privately worries about others, helps those in need regardless of past conflicts, and observes struggles even if outwardly unreactive. He avoids vulnerability, dodging feelings or peer invitations, and retreats to secret spaces when invaded, expressing visceral discomfort. Gradually, during his second year, he allows others limited access to his spaces. Within Switch, he shows contrasting relationships: harshness toward Tsumugi juxtaposed with caring behavior toward Sora and an inability to refuse Sora's requests. Sora views him as warm and kind, aspiring to match his magical skill. He struggles with individuals immune to his magic, like Tsumugi or Anzu, reacting with frustration. He exhibits recklessness, pushing himself to physical detriment for those he cares about (like Shu Itsuki or Sora) or acting impulsively, sometimes neglecting others' emotional states. Afterwards, he often shows extreme remorse through repeated apologies or self-punishment. His protective instincts lead him to interfere in situations involving loved ones, despite maintaining a cool, aloof image. Distinctive traits and fears include creating secret passages and hidden cameras around campus; an aversion to swimming, leading to avoidance of related activities like P.E. classes; varying daily fragrances noted by peers; baking skills; a love for games coupled with an intense dislike of losing; and a belief that education constitutes brainwashing. Sora perceives his "color" as beautiful, sparkly, and jewel-like.