Nana Daiba, affectionately nicknamed "Banana," is a second-year student in the Actor Training Department within Seisho Music Academy's 99th Graduating Class. She possesses emerald-green eyes and dark-blonde hair, characteristically styled in banana-resembling half-twintails secured with chartreuse ribbons. Standing 170 cm tall, she is the tallest among her peers. Her standard attire is the Seisho uniform: a gray blazer, red ribbon tie, and brown loafers. Her revue outfit comprises a white jacket with golden piping, a light-gray skirt, and a red pelisse jacket. She wields twin Japanese swords named "Meguri" (輪) and "Mai" (舞), which combine to form "Rinbu" (輪舞), meaning "rondo." Her background includes extensive theatrical training: classical ballet since 2009 and vocal music since 2014. She attended Toyama Municipal Junior High School No. 7 and earned an Award of Excellence in the National Junior High School Drama Contest. A pivotal moment occurred when she met Hisame Honami after retrieving scattered script pages; Nana complimented Hisame's singing voice and invited her to join the theater club. Though Hisame later quit due to external pressures, Nana harbored no resentment, and they reconciled during the Revue of First Snow. Personality-wise, Nana presents as kind, nurturing, and motherly towards her classmates, frequently cooking snacks and offering support. This demeanor conceals a deeper obsession rooted in past loneliness. After experiencing the "perfect" first-year performance of "Starlight," she developed a compulsive desire to preserve that moment, trapping her classmates in a time loop. Using her ability to reset time, she forced them to relive the 99th Seisho Festival performance repeatedly—over 60 loops—preventing change to maintain their collective happiness. This action conflicted with her friends' growth, particularly Karen Aijo, who believed theater's ephemeral nature gave it value. Nana's reliance on photography symbolized her fixation on preserving memories; she constantly viewed the world through her phone or camera lens, distancing herself from the present. Her motivations stem from fear of abandonment and a longing for connection. The loops allowed her to protect the camaraderie of the original "Starlight" cast, where all nine classmates participated. When Hikari Kagura transferred to Seisho mid-year—an anomaly in previous loops—Nana perceived her as a threat to stability. To maintain control, Nana joined the production crew for the next "Starlight," insisting on replicating the prior year's casting to exclude Hikari. This culminated in the "Revue of Solitude," where she dueled Karen and Hikari to preserve the loop. Her defeat ended the cycles, forcing her to confront the inevitability of change. In later developments, particularly movie continuity, her perspective evolved. While still cherishing past bonds, she gradually accepted impermanence. Her revue introduction shifted from "I will protect them! Forever... Again and again!" to acknowledging the futility of resisting time: "If it is fate that you must ripen and fall, then now, I'll offer you a beautiful end." Relationships highlight her complexity: Karen Aijo coined her nickname "Banana" for her sweet nature but opposed her static worldview; Junna Hoshimi respected her as "a true stage girl"; Maya Tendou questioned her lack of ambition despite her talent, symbolizing Nana's rejection of traditional success; her dynamic with Hikari represented disruption versus preservation. Nana dislikes spicy food and being alone, enjoys cooking with bananas, and collects frog-themed items. Her surname "Daiba" (大場) means "big place," referencing her role as a "precious place" to protect, while "Nana" phonetically suggests "banana," aligning with her yellow-themed aesthetic.