Momoyo Koyama, born on November 30, 1995, in Sapporo, Hokkaido, is a noteworthy figure in the Japanese entertainment scene, celebrated for her dynamic performances in both live-action and voice acting. Collectors particularly seek her out for her role as Karen Aijō in the acclaimed multimedia franchise Revue Starlight, with the standout release being the 2019 stage production Revue Starlight Orchestra Live "Starry Konzert." This title is highly prized among fans for its captivating blend of music and storytelling, showcasing Koyama's impressive range as a performer. Her earlier work as Sailor Mercury in the stage adaptations of Sailor Moon in 2014 and 2015 also remains a significant highlight of her career. These productions not only resonate deeply with nostalgic audiences but have become coveted items for collectors due to their limited physical media releases. Koyama's unique contributions to these beloved franchises make her a key figure in the realm of collectible media, ensuring her works are sought after by fans and collectors alike.