Kageo first appears in the Curien Mansion in the first House of the Dead game, originally with the name "Mummy". As stated in the Sega Saturn manual, Mummy was created by Curien sometime after that of Ebitan, as he wanted to "create something a little drier for a change". Mummy's structure was (humorously almost) off a Japanese model Curien encountered at a trade journal, possibly revealing his extremely thin build was based off an anorexic human. The manual further explains that he wanders around damp areas to keep himself from drying out, explaining his preference for darker and more dreadful areas. True to his mummified appearance, his resilience is lower compared to the other zombies infesting the Curien Mansion.