Megumi Tateishi is a Japanese voice actress also known by the stage name Ryouko Tezuka. She was born on October 15 and has worked as a freelancer, with past affiliation to the agency Azurite Company. Tateishi is primarily recognized for her work in original video animations, net animations, and adult game adaptations.

Her filmography includes a range of supporting roles across various series. In the Nekopara franchise, Tateishi voices the catgirl Coconut, a role she has performed in multiple adaptations. This includes the Nekopara OVA released in 2017, the net anime Nekopara: Koneko no Hi no Yakusoku from 2018, and the Nekopara visual novel series. She also played the character Kasumi Iida in the 2019 television anime adaptation of the game Circlet Princess, produced by SILVER LINK. Additionally, Tateishi took on the lead role of Azu Takamori, a housewife, in the 2018 net anime Holiday Love, an adaptation of the adultery drama manga.

Beyond these more widely known titles, her other credits consist primarily of roles in adult-oriented animations. Notable examples from the late 2010s and early 2020s include appearances in series such as Taimanin Asagi, Venus Blood: Brave, and The Carnal Cult. A recurring pattern in her career is voicing characters in the Nekopara franchise across different media formats over several years, demonstrating a long-term association with that series.