Koge-Donbo is a Japanese manga artist and illustrator born on February 27, 1976, in Tokyo, Japan. She also works under the name Kokoro Koharuno. Her professional career began after she finished college, initially creating works for the doujinshi (self-published) market. The creator adopted the pen name Koge-Donbo from the name of Akira Toriyama's pet cat, combining "Koge" with "Donbo," a word intended to convey the concepts of crying and disaster.

The creator is most widely recognized as the original character designer for the franchise Di Gi Charat. Originally conceived as a mascot character for the Japanese retailer Broccoli, the catgirl Dejiko became the center of a major media franchise. Koge-Donbo is credited as the original creator for numerous anime titles in this franchise, including Di Gi Charat Kuchi Kara Bazooka, a special that aired in 2002, as well as the Di Gi Charat Omake Special and other series like Di Gi Charat Nyo and Panyo Panyo Di Gi Charat.

Beyond the Di Gi Charat franchise, Koge-Donbo has created several other successful manga series that have been adapted into anime. The first major professional manga serialized was Pita-Ten, which ran from 1999 to 2003. The story, about a boy and his neighbor who claims to be an angel, was later adapted into an anime television series. Following this, the creator wrote and illustrated Kamichama Karin, a magical girl manga published in Kodansha's Nakayoshi magazine from 2003 to 2006, which was also adapted into an anime. Additional roles include serving as the original character designer for the anime series A Little Snow Fairy Sugar.

The artistic identity of Koge-Donbo is strongly defined by a cute and ornate visual style, though narratives often contain a blend of lighthearted and melancholic elements. While the surface of works like Di Gi Charat appeal to a broad audience, the creator has stated that underlying themes of darkness or misfortune are often present. A personal interest in Japanese history, particularly the Meiji and Taisho periods, also informs the setting and design of some works, such as Pita-Ten.

Within the anime and manga industry, Koge-Donbo holds significance as a creator whose original mascot character evolved into a substantial multi-media franchise. The Di Gi Charat series alone generated numerous manga, anime television series, films, and specials throughout the 2000s and beyond. The creator has been recognized internationally as a guest of honor at major conventions such as Otakon in 2004 and Anime Expo in 2006. Koge-Donbo's manga have been translated and published in numerous languages, including English, German, French, and Spanish, contributing to the global spread of early 2000s moe and magical girl aesthetics.