Mr. Koike is a supporting character in the anime Obake no Q-Taro. He lives as a neighbor of the Ohara family, most notably of the young boy Shota Ohara. His occupation is that of an animator, and he has a particular fondness for instant noodles. Koike appears not only in this series but is a recurring figure across many works by the creator Fujiko Fujio, and he is present in multiple anime adaptations of Obake no Q-Taro, including the 1965 and 1985 series. He is depicted as an adult male with black eyes and short brown hair that reaches his ears. Within the story, Koike serves as a familiar adult presence in the neighborhood and interacts with the main characters on occasion. Information about his personal motivations or any significant character development is not documented in available materials.