Jam is a stuffed animal shaped like a moon bear, or Asiatic black bear, who lives among the other toy characters in the world of the anime Tomica & Tom. His background is that of a plush toy that comes to life when humans are away, and he is one of the friends who interact with Tom and the miniature Tomica cars. Personality-wise, Jam is highly competitive and has a strong sense of rivalry toward Tom, always looking for ways to outdo him or challenge him. He is stubborn and can be pushy, sometimes causing trouble by trying to take charge or prove himself. His main motivation stems from a desire to be seen as big and strong; he admires powerful or large things and aspires to match them, which fuels his constant competition with Tom. In the story, Jam serves primarily as a friendly rival to Tom, creating light conflict and driving playful, energetic interactions within the group. His key relationships include his ongoing rivalry with Tom, which is central to his character, and he also interacts with other toys such as Chuu, Marie, Chubets, and the toy named Omocha. Throughout the series, Jam shows moments of growth as he learns to balance his competitive nature with cooperation, though his core drive remains his admiration for strength and his desire to prove himself. Notable abilities are not emphasized beyond his being a plush toy capable of movement and interaction like all the other characters; his main strength lies in his determination and spirited attitude.