|This article is about Diana the cat. For Diana the fairy, see Diana the Moon Fairy.|
|Alignment:||Moon Kingdom, Crystal Tokyo|
|Species:||Intelligent domestic cat of Mau descent|
|Lives:||Crystal Tokyo; later Azabu-Juuban, Minato-ku, Tokyo|
|Occupation:||Advisor to Sailor Chibi Moon, temporary guardian to the Space-Time Door (manga)|
|Family:||Luna (mother), Artemis (father)|
|Associates:||Sailor Pluto, Mamoru Chiba, Chibiusa|
|First Anime Appearance:||Artemis' Affair? A Mysterious Kitten Appears|
|First Manga Appearance:||Act 18 Time Warp - Sailor Pluto|
|First PGSM Appearance:||N/A|
|Actors:||Kumiko Nishihara (anime); Loretta Jafelice, Naomi Emmerson (dub)|
| Diana in the manga|
In the manga, Diana appeared significantly earlier than she did in the anime. She appeared during the Black Moon arc, which corresponds with the second storyline of the R season. Like her mother and father, she had the ability to take on human form in times of crisis, though unlike them she retained her tail. Like Chibiusa, her hair was bound in odango on the sides of her head.
She was friendly with Sailor Pluto, due to the fact that Pluto and Chibiusa were friends, and guarded the Space-Time Door for Pluto when she convinced Pluto to join the battle against the Black Moon Clan.
In the anime, Diana did not appear until the SuperS season. The anime did not show any evidence of her bond with Sailor Pluto, nor did she ever take on human form or guard the Space-Time Door.
 Video Games
- The name "Diana" was also used for a fairy in prototype drawings by Naoko Takeuchi. This "fairy" concept was eventually scrapped.