|Lives:||Juuban, Minato-ku, Tokyo|
|Family:||Naru Osaka (daughter)|
|First Anime Appearance:||Crybaby Usagi's Magnificent Transformation|
|First Manga Appearance:||Act 1 - Usagi - Sailor Moon|
|First PGSM Appearance:||Act 1 - I am Sailor Moon!|
|Actors:||Michiko Abe (anime), Noriko Watanabe (PGSM)|
Mayumi Osaka was the name given to Naru's mother in PGSM; in the other series she was never given a name. In all versions of Sailor Moon, she owned the Osa-P jewellers, and was either replaced or possessed by a Youma who became Sailor Moon's first opponent.