Miki-san is a supporting character in the slice-of-life comedy series I Can't Understand What My Husband is Saying. She appears in both the first season and the second season, 2nd Thread. Miki-san is a woman in her mid-twenties who works as an office clerk at a data-entry company. She is portrayed as an energetic and outspoken person with a strong passion for otaku culture, specifically as a self-proclaimed fujoshi. Her primary interest lies in Boys Love, or BL, manga and doujinshi, and she habitually sees romantic tropes in everyday interactions, often mentally pairing people she observes into imagined BL scenarios. This tendency extends to her friend group, where she playfully tries to ship characters like Kaoru's husband, Hajime, with other male acquaintances for comedic effect.

Miki-san's motivations are rooted in her love for analyzing romantic narratives and her desire to inject excitement into ordinary situations. She dislikes what she considers boring moments without romantic tension, and she uses her imaginative BL filter to liven up conversations and after-work gatherings. Despite her obsessive and sometimes intrusive hobby, she is a supportive and loyal friend. She deeply cares for her close circle, which includes her coworkers Kaoru and Tanaka-san, and she often provides encouragement through her own quirky perspective.

In the story, Miki-san serves as a comic foil and a representative of a different facet of otaku culture, contrasting with Hajime's more general anime and internet fandom. She is also a capable professional. She holds a managerial or directorial role at her workplace, and she becomes Hajime's employer when he takes a job as a net-designer for the business she runs. She also organizes offline manga meetings and is involved in the otaku community, which allows her to connect with other enthusiasts, such as Mayotama, Hajime's younger brother, through their shared interest in doujinshi.

Key relationships define her role. She is best friends with Kaoru and Tanaka-san, with whom she often gossips about BL manga during breaks and after-work drinking sessions. Her dynamic with Kaoru provides comic relief as she tries to fit Kaoru's life events into romantic tropes. With Tanaka-san, who is more grounded, Miki-san's wild theories are tempered, creating a balanced trio. She also develops a professional rapport with Mayotama, bonding over the manga industry. Her connection to Hajime is both as a friend and as his employer, and she interacts with him in group settings where she playfully includes him in her shipping jokes, though she respects his marriage to Kaoru.

Miki-san's character shows little significant development across the series, remaining largely consistent in her fujoshi enthusiasm and supportive role. She is known for her ability to spot what she calls moe moments in daily life, and her outspoken nature often leads to misunderstandings, such as when she initially mistakes Mayotama for a girl due to his feminine appearance, only to later become excited upon learning about his cross-dressing and BL interests. She embodies the energetic otaku archetype, providing humor through her single-minded passion, but she also demonstrates loyalty and practical competence. Her notable ability is her skill in organizing events and her leadership in the workplace, contrasting with her playful personal life. Overall, Miki-san is a vibrant side character who enriches the series with her unique perspective on romance and otaku culture, while remaining a dependable friend and professional.