I loved so many... Grim Adventures of Billy and Mandy, Courage the Cowardly Dog, Cow and Chicken, Catdog, Hey Arnold!, Arthur, Danny Phantom, Ed Edd n Eddy, Rugrats, Animaniacs, Flintstones, Loony Tunes, Tom and Jerry, Dexter's Laboratory, Johnny Bravo, Powerpuff Girls, Spongebob, Avatar the Last Airbender, Pokemon... it's so hard to pick! I had a new favorite every week growing up, and each show is dear to my heart.... except maybe a couple that I don't remember so well. In retrospect I love atla the most because it's geared less towards 8-year-olds.