Chū is a small stuffed mouse plushie and one of the two main characters in the anime Tomica & Tom. He is the close friend and constant companion of Tom, the teddy bear protagonist. When the humans in the house are asleep or away, Chū and Tom come to life and use the Tomica toy vehicles to go on miniature adventures around the home. Chū has a particular fondness for the drum and often plays this instrument. His personality is playful and energetic, and he is always ready to explore or get into a game with Tom. He may also have a slightly mischievous streak, as seen in picture-book stories where he runs off with a Tomica and needs to be found. Chū’s main role is as Tom’s partner and sidekick, and their relationship is built on mutual trust and shared enthusiasm for Tomica. Together they turn ordinary rooms into vast landscapes for racing, pretending, and problem-solving. While the series focuses on gentle, slice-of-life moments rather than dramatic character arcs, Chū’s loyalty and cheerful nature help drive the duo’s adventures. His abilities mainly involve interacting with the Tomica toys—he can drive, push, or ride them—and he is often the one who instigates new games. Chū’s presence adds a lively, rhythmic energy to the pair, and his bond with Tom remains the emotional center of their secret world.