Rugrats
SpongeBob
Fairly Oddparents
Avatar: The Last Airbender
The first two are indisputable. There are like five shows competing for those last two spots (the other three being Ren & Stimpy, Doug, and Hey Arnold; I simply went with the ones with the most staying power).
Help control the pet population. Have your pets spayed or neutered!
RIP Bob Barker (1923 - 2023) - and thanks for all the memories.