Joe (short for Josephine) Stone is a human forest ranger living in the woods on Ui.

Joe has silvery hair and dark skin, and is also notable for her prosthetic leg, generally hidden beneath her jeans. She works at a small ranger station some distance from Coyote, where she keeps the forest safe and sorts out any lost travellers. She is practical and not afraid to use weapons where necessary, but has a kind heart and feels protective towards Kit. Despite being employed by the local government of Coyote, she does not agree with their policy of exterminating Jitai, and is actively trying to keep Kit safe.

It has been stated that Joe once had a boyfriend, but they are no longer together. She thinks of him as "psychotic".