Nana Daiba is a second-year student in the Actor Training Department at Seisho Music Academy's 99th Graduating Class. She has emerald-green eyes and dark-blonde hair styled in signature half-twintails resembling bananas, secured with chartreuse ribbons. Standing at 170 cm, she is the tallest in her class. Her Seisho Academy uniform includes a gray blazer, knife-pleated skirt, white button-up shirt, red ribbon tie, brown loafers, and black crew socks. Casual wear features a long yellow blazer, denim shorts, and a white T-shirt, while her revue performance outfit comprises a white jacket with golden piping, light-gray skirt, and red pelisse jacket. She wields twin Japanese swords named Meguri and Mai during revues. She attended Toyama Municipal Junior High School No. 7, studying classical ballet since 2009 and vocal music since 2014. Her Award of Excellence in the National Junior High School Drama Contest preceded a pivotal encounter with Hisame Honami when script pages blew out a window. Nana complimented Hisame's singing and invited her to the theater club, though choir club interference later strained their friendship. Nicknamed "Banana" by Karen Aijo for her nurturing demeanor, Nana adopts a motherly role in her class, baking banana treats and supporting peers. This warmth masks deeper complexities from past loneliness and separation anxiety. After the 99th Seisho Festival's "Starlight" production delivered profound fulfillment through collaboration, she fixated on preserving that perfect moment. Winning underground revue auditions granted Nana time-manipulation abilities. She looped the first-year "Starlight" production roughly 60 times to prevent change and protect friendships. Stagnation manifested as obsessive photography and resistance to altering scripts or castings for the next festival. Her revues emphasized protection, symbolized by ripe fruit needing safeguarding from decay. Hikari Kagura’s arrival disrupted the loops, eroding Nana's control. Karen defeated her in the "Revue of Bonds" by championing momentum over stasis, and Hikari overcame her in the "Revue of Solitude." These losses unraveled Nana's motivations, exposing trauma from classmates' departures and childhood isolation. Roommate Junna Hoshimi guided her to accept impermanence through reassurance of enduring support. In later developments, particularly the 2021 film, Nana adopts militaristic symbolism. Her revue introduction references the anti-war poem "Kimi shinitamō koto nakare," and her uniform evokes the February 26 Incident—a 1936 military rebellion. This aesthetic underscores her drive to forcibly end stagnation. She confronted Junna about artistic complacency, challenging reliance on external validation while advocating self-driven ambition and fluid identities. Junna defeated her in the "Revue of Hunting," cementing Nana's acceptance of evolving relationships and artistry. Key bonds shape her arc: with Karen, opposing views on theatrical ephemerality clash—Karen cherishes transience, Nana initially clings to preservation. With Junna, mutual respect deepens into a partnership navigating uncertainty. During the "Revue of First Snow," Nana reconciled with Hisame Honami, expressing no resentment over her theater club departure. Symbolism defines her: the banana motif reflects nourishment and dependency, while fruit imagery evolves from protected produce to "ugly fruit" decaying from avoided progress. Historical parallels tie her to preservation-versus-transformation conflicts. Her swords' names—Meguri (cycle) and Mai (dance)—combine as "Rinbu" (rondo), echoing her pre-growth repetition. Trivia notes include her preference for frog-themed items, aversion to spicy foods, and poor sleeping posture. Her surname "Daiba" (大場) translates to "big place" or "precious place," reflecting her protective nature.