Luna		Luna is Sailor Moon's Guide Cat. She is there to train Sailor Moon and the other Scouts. She gave the Scouts their Transformation Pens and Sailor Moon her locket. She becomes human in one of the movies, where she first has a crush on a astronimaer. But at the end, she and artemis are together.
Artemis	Artemis is the guide cat to Sailor Venus. He trained her to be Sailor V and then aided Luna when the Scouts where reunited. He was also Central Control.
Diana	Diana is Chibi-Usa/Rini's Guide Cat from the Future. She is Luna and Artemis's Child. In the Picture she is the one on top of Luna and Artemis's Backs.