Renka Misaki (岬 蓮香) is a fictional character featured in the adult visual novel and OVA series "Akiba Girls." She has brown hair, often styled with spiky bangs, blue eyes, and a slim physique. Though her exact age is unspecified, she is portrayed as an adult. Professionally, Renka works as a successful voice actress using the alias Tetsuko (テツコ). A key plot point involves her being cast in a hentai production, a role outside her experience, leading her to seek guidance from her dedicated fan, Nikita Shindou, the protagonist.

Renka exhibits a tsundere personality, presenting as blunt and short-tempered initially while possessing underlying kindness. She is stubborn and refined, frequently attempting to project a "big sister" image in real life. However, her passionate and sometimes impulsive nature often causes this persona to falter. As a member of the "Alternative Trivia Research Club" alongside Nikita and others like Tamaye Akiyoshi, her club involvement facilitates several sexual encounters within the series.

Beyond "Akiba Girls," Renka appears in the visual novel "Shichinin no Online Gamers ~Offline~." In this game, she operates under the online identity ＴＥＴＵＫＯ(´∀｀) or "Tetuko," playing as a powerful Witch-class magic user specializing in dark attributes. Her gameplay emphasizes calm strategic judgment and high firepower. Renka demonstrates mastery of the game's mechanics, often mentoring or teasing newcomers. Her online persona originated from encountering the game's protagonist due to a shared "iron" character in their names, leading to her characteristic rebuke: "Don't imitate me!" This portrayal maintains her tsundere traits within a competitive gaming context. Her role remains consistent across appearances, defined by her voice acting challenges, club activities, and dual identity in online gaming.