Which of these cartoon characters was the last to appear on TV?

SpongeBob SquarePants is an American animated television series created by marine biologist and animator Stephen Hillenburg for Nickelodeon. The series chronicles the adventures and endeavors of the title character and his various friends in the fictional underwater city of Bikini Bottom. Nickelodeon held a preview for the series in the United States on May 1, 1999, following the television airing of the 1999 Kids' Choice Awards. The series officially premiered on July 17, 1999.

"Good Night" is the first of forty-eight Simpsons shorts that appeared on the variety show The Tracey Ullman Show. It originally aired on the Fox network in the United States on April 19, 1987. The first appearance of the Simpson family including Homer, Marge, Bart, Lisa, and Maggie on television.

Cartman first appeared, originally named Kenny, in prototypical form in a 1992 animated short Jesus vs. Frosty, and a 1995 animated short Jesus vs. Santa, and first appeared on television in the pilot episode of South Park, "Cartman Gets an Anal Probe", on August 13, 1997.

Stewie Griffin appeared in "Death Has a Shadow" the pilot episode of the American animated television series Family Guy. It originally aired on the Fox network in the United States on January 31, 1999, just after Super Bowl XXXIII.