Baron is the mysterious cat doll in Whisper of the Heart. It's a very detailed and whimsical toy, and is actually based on a statuette owned by the author of the manga. She saw it in a shop, but couldn't afford it even though she fell in love with it. When she finally came back with money, it was gone. As it turned out, her boyfriend had bought it for her. They eventually married.

Although inanimate, Baron (and his fantasy-world counterpart) play a substantial role in the film, responsible for much of the magical feel of the tale.