These are the Royal Cats~ Artemis, Luna, and Diana. Here is some quick info about them:
1.)Luna (the black cat) is Sailor Moon or Serena's guardian
2.)Artemis (the white cat) is the one who founded Venus in England and brought her back to Tokyo. He is Venus's guardian
3.)Atremis is in love with Luna :)
4.) Diana is the gray kitten, who is Rini's guardian
5.) Diana is Luna and Artemis's daughter
