There are 3 gardian cats in Sailor Moon. Luna, Artemis and their daughter Diana.
Luna:
Luna is the black girl cat. Her duty is to be Serena's guardian.
Her main mission was to find Sailor Moon and then help Sailor Moon find
the Moon Princess. Little did they know Serena/Sailor Moon was the Moon
Princess! Because Serena is such a bone head it was very hard for Luna
to ever get any work done.
In the Sailor Moon S movie Luna transforms into her human self.
Artemis:
Artemis is the little white boy kitty. His mission was to be the guardian
of Sailor V. Then they meet up with the rest of the sailor scouts and he
helps Luna try to find the Moon Princess.
Diana:
Diana is the greyish/purplish girl kitty. She is Luna and Artemis's
dauther. She lives in the 30th century with the Small Lady, but comes back
to the 20th century for a little while.
To see pictures of all the Cats go to the Cats Picture Gallery.