1, Little Police Car Xiaoji: Xiaoji is the main character of the movie and comes to Xinduhui with a dream of being a police officer to look for his missing father, Daka.
2. Toot Toot, the cleaning car: Toot Toot is the first friend Xiaoji meets in Xinduhui and helps Xiaoji adapt to city life.
3. Ambulance Rue: Rue is a medical car incarnate with a deep compassion for the sick and injured.
4, Engineering Vehicle Art: Art is a very smart engineer who specializes in solving all kinds of puzzles.
5, Fire Truck Dare: Dare is the guardian of the city and is always the first place to show up for fires or other emergencies.