Diana is the third feline character to make an appearance, though the circumstances of her introduction differ between versions. In the manga, she first appears in Act 18 when the Senshi travel to the 30th century. There, it is revealed that she is the child of Luna and Artemis. When the Senshi return to the 20th century in Act 23, Diana accompanies them. In the anime, she does not appear until Episode 133 of the SuperS series, where a grey kitten suddenly jumps out of the bushes, calls Artemis her Daddy, and nuzzles up against him. Artemis is confused and horrified, while Luna, feeling betrayed, scratches him across the face and runs off. It is later revealed that Diana has come from the future.
Just as Luna and Artemis guide Usagi and Minako, Diana serves as a guardian to Chibiusa. She is very curious, eager to help, and deeply polite, always addressing Usagi and Mamoru with the Japanese honorific "-sama" and calling Chibiusa by her formal title, Small Lady. Despite her youth, Diana often assists the Senshi, thanks to the knowledge she has gained from the future.
In both the manga and anime, Diana has red eyes.
(Source: Wikipedia)
