Tubby a kindergarten student at Third Street School. His main duty in his kindergarten class is to chase big kids out from amongst them. The big kids have no trouble escaping him because he is so slow, hence his weight. He can produce the best burps at Third Street except for the brief time when Jared Smith, who could do everything better than everyone, moved there. Tubby is very dedicated and has a strong sense of right and wrong. This is illustrated in "Kindergarten Derby" when Tubby expresses his wish to show everyone that fat people are just as good as skinny people. He decided that people would appreciate fat people if he could win the derby, and so he dedicated himself to training with the help of Mikey. While he was training, he noticed how the other kindergartners were being treated like horses by the big kids. In response to this terrible treatment and as a tribute to his trainer, Mikey (who had been the only kid in the history Third Street to not finish the race), Tubby's wish, as granted by King Bob for winning the derby, was to end the tradition of the Kindergarten derby.
Father: Unknown father
Mother: Unknown mother
Friends: Hector, Captain Sticky, Gilbert, Cindy, Emma, Jake, Spencer, Zedd, the Brittanys, Big Kids (especially TJ Detweiler, Vince LaSSao, Ashley Spinelli, Gretchen Grundler, Mikey Blumberg, Gus Griswald, Randall Weems, Menlo, the Ashleys, Scribe Kid, Jordan and Jerome, King Bob and other good Third Street School students) (sometimes), Miss Finster, Principal Prickly, Miss Grotke and Mrs Klemperer
Enemies: Big Kids (especially TJ Detweiler, Vince LaSSao, Ashley Spinelli, Gretchen Grundler, Mikey Blumberg, Gus Griswald, Randall Weems, Menlo, Miss Finster, Principal Prickly, Miss Grotke, the Ashleys, Scribe Kid, Jordan and Jerome, King Bob and other good Third Street School students) (sometimes), Earwin Lawson, Gelman, Conrad Mundy, Greg Skeens, Sue Bob Murphy, Lazy Kid, Chucko Kowalski, Jocko, Buster, Cheay, Koreo and Kurst the Worst
Likes: Food, burping and chasing after Big Kids
Dislikes: Being outrun and escaped by Big Kids, troublemakers causing trouble (mainly Lawson) and being framed by troublemakers