Sanzu works as an editor at Autumn Publishing. She sports pink hair styled in short twin tails reminiscent of cat ears and possesses pink eyes featuring distinctive star-shaped pupils. Her standard outfit includes a black jacket, white collared shirt, black pencil skirt, stockings, and black strap high heels. She often wears a cat-like smirk that reveals sharp triangular teeth. She displays volatile emotions, shifting rapidly from excitability to vengeful outbursts. Sanzu harbors a powerful obsession with the vampire hunter Ronaldo, frequently directing dirty double-meaning innuendos his way. This fixation fuels her one-sided rivalry with fellow editor Fukuma, driving her repeated attempts to have Ronaldo transferred to her supervision through competitions called Ronaduels or editor conferences. Despite these efforts, she consistently fails to secure the role of main editor for the Ronaldo Chronicles series. Her connection to Ronaldo began when she discovered his blog before its serialization. Upon learning of the series' publication plans, she joined Autumn Publishing specifically to work with him. Sanzu later encountered Ronaldo directly when he rescued her from an inferior vampire outside Autumn Publishing headquarters, an event that deepened her fixation. Serving as vice editor for Draluc's game review column brings her into contact with characters connected to Ronaldo's circle. She also exchanged messaging app contact information with Tō Handa to share intelligence about Ronaldo. Sanzu possesses combat abilities tied to her background: she hails from Sanga, coming from a village of ninjas, and holds an official ninja license. Her primary weapon is a giant star-shaped shuriken. Additional notes include her specific interest in sparkling sweat.