I don't have a lot of pictures of the kitties, or a lot of information. But I can tell you that Luna is Usagi's cat, she is the one who gave her the Silver Crystal and told her of her powers. You know, the whole reincarnation thing? I think Luna was one of Princess Serenity's advisers in the Silver Millennium. Or something like that. Artemis came into the picture with Minako, he had played the same part as Luna, but for Sailor Venus rather than Sailor Moon. It wasn't hard to see where this would go, two sentient cats, one male, one female. You don't have to be Einstein! Chibiusa [Rini] had an odd toy thing called Luna-P in "Sailor Moon R". But apparently, when she comes back in "S" or "Super S" which ever one it is a little kitty follows. This is Diana, the 'daughter' of Artemis and Luna. Luna thought that Artemis had been unfaithful when she first found out about Diana, but later, all was revealed. When Diana went back to the future Artemis was so cut up he even cried [he he he, poor kitty] Yeah, and Diana and Artemis are both names for the goddess of the Moon. Luna is also a moon term.