|Lives:||D Point, near the North Pole|
|Occupation:||Youma under the command of Nephrite|
|First Anime Appearance:||A Powerful New Enemy! Nephrite's Evil Crest|
|First Manga Appearance:||N/A|
|First PGSM Appearance:||N/A|
|Actors:||Michiko Abe (anime), Maria Vacratsis (DiC dub), Cindy Robinson (Viz dub)|
Once Rui reached her maximum energy potential, Tesuni apeared from the racquet and drained her of her energy. When Sailor Moon arrived to help the girl, Tesuni trapped her inside a giant tennis ball. Tuxedo Mask arrived and distracted the Youma by striking her with his cane, which allowed Sailor Moon to free herself.
- Her name is a reordering of the Japanese syllables for the word "tennis" (テニス).