Charles Crandall "Chuckie" Finster, Jr. is Tommy's best friend and the main deuteragonist of the Rugrats series. He is also the main protagonist of Rugrats in Paris: The Movie. He even grew into Preteen in All Grown Up.
- Chuckie is voiced by Nancy Cartwright (who voiced Bart Simpson), who replaces the late Christine Cavanaugh, respectively.
- Chuckie's imaginary friend is Barney the Dinosaur.
- Chuckie will guest star in Winnie the Pooh Meets Spider-Man 2.