|Lives:||Azabu-Juuban, Minato-ku, Tokyo|
|Occupation:||Juuban Municipal Primary School student|
|Family:||Yoshiko Kayama (mother)|
|First Anime Appearance:||A Youma's Scent! Chanelas Steal Love|
|First Manga Appearance:||N/A|
|First PGSM Appearance:||N/A|
|English Name:||Mika Cassidy (dub), Mika Kayama (Viz dub)|
|Actors:||Chieko Nanba, Ayako Shiraishi (anime); Kathy Laskey (DiC dub); Michelle Ruff (Viz dub)|
Mika Kayama was an award-winning maker of French dolls, and one of Shingo Tsukino's friends. She first appeared in episode 5, in which she was one of many who were hypnotized by a Chanela.
Mika appeared again in episode 18, in which she won a doll-making competition with a French doll that she made. She tried to give the doll to Shingo, but he accidentally broke it, which devastated Mika. She was then targeted by Nephrite, who implanted the Youma Jumeau into the doll she was working on and commissioned her to make ten more. As she made the dolls she fell under the Youma's influence, and as she finished the last one it emerged and drained her energy.
Shingo happened to be nearby when the Youma appeared and unsuccessfully attempted to defend her. Sailor Moon, Sailor Mercury, and Sailor Mars fought the Youma with the assistance of Tuxedo Mask, and once it was destroyed, Mika's energy was restored and Shingo was able to apologize for what he had done.