Sailor Moon
Usagi has a cat named Luna, named after the Latin word for moon. Minako has a cat named Artemis after the Greek goddess of the moon (although Artemis is a male cat). Luna and Artemis are not ordinary cats. They can talk, and they have moon symbols on their foreheads. They can also turn into humans in the manga, and Luna turns into a human in one of the anime movies. In the future, they have a kitten named Diana (Diana is the name of the Roman moon goddess).