Kanon is a supporting character from the 1998 anime film Galaxy Express 999: Eternal Fantasy. She is a synthetic humanoid entity with a female appearance, serving as the train's new interface used to communicate with passengers. In physical terms, the character possesses white hair that reaches down to her hips and purple eyes, with an overall design that presents her as an adult figure.

Kanon is depicted as being very cordial and sociable in her interactions with others. During the film, she demonstrates this personality when she explains several of the train's key characteristics to the protagonist, Tetsuro Hoshino. Her fundamental nature is that of an interface or an avatar created for the Galaxy Express 999 itself; a manga manuscript description from the creator notes that she functions as an incarnation of the train. Her design is noted for combining an exquisite beauty with a characteristic cuteness.

In the story of Eternal Fantasy, which takes place one year after the fall of the机械帝国 (Mechanical Empire), Tetsuro has been living on a conquered Earth where humans are being forcibly turned into mechanical beings. Kanon meets Tetsuro after the Galaxy Express 999 arrives to rescue him, and she is present aboard the train during this new journey. Her role is primarily to serve as a guide and a personification of the train's spirit, helping the primary characters navigate their situation. Regarding her relationships, she is shown interacting with the main cast, including Tetsuro and Maetel, and also reunites with the character Claire, the crystal girl, who has been rebuilt.

Information concerning a significant developmental arc for the character of Kanon or specific personal motivations beyond her designed function as the train's interface is not available. Similarly, while the character is an entity connected to the Galaxy Express 999, no direct record of distinct combat or supernatural abilities outside of her primary duty as a synthetic guide could be verified.