Matabei Gotō is a tall, large-framed young woman who attends Buou Academy and carries the name and legacy of the historical spear master Gotō Matabei. Despite her imposing stature and fierce reputation on the battlefield, she is gentle, shy, and often taciturn, rarely speaking unless necessary. She possesses a keen sense of smell that is almost canine-like and has a noted fondness for certain scents, which hints at an unusual sensitivity. Her quiet demeanor contrasts with her explosive combat style: she wields a long spear longer than her own height, earning her the epithet “Spear Matabei” and making her a formidable opponent. Off the battlefield, she enjoys cooking and eating, and she is known to be something of a bath enthusiast, though she can be surprisingly clumsy in everyday situations.

Matabei’s primary motivation is unwavering loyalty to Yukimura Sanada, whom she serves as a bodyguard and most trusted retainer. She is deeply committed to the Toyotomi faction’s cause of challenging the Tokugawa shogunate, and she is always at Yukimura’s side, protecting her from danger and aiding in their plans. Her sense of duty is serious to a fault, and she takes her role as protector with great vigor. Though she rarely displays emotion, her bond with Yukimura is the central driving force behind her actions.

Within the story, Matabei functions as a supporting character and a key member of the anti-Tokugawa group. She frequently assists Yukimura in infiltrations and battles, using her impressive spear skills to hold her own against even master samurai. Her relationship with Yukimura is close and devoted, resembling that of a knight and liege, while she shares a quieter rapport with other retainers like Hattori Hanzō. Over the course of the series, Matabei remains consistent in her loyalty and does not undergo a dramatic personal transformation, but her presence reinforces the themes of allegiance and camaraderie among the Toyotomi supporters. Her notable abilities include mastery of the yari, physical strength that allows her to wield an oversized weapon with ease, and a secondary tanto for close-quarters combat. Combined with her heightened sense of smell, she is both a powerful fighter and a perceptive guardian.