I feel like so many of these are going to be repeated! LoL.
I'd have to say:
Rugrats . Doug . The Wild Thornberries . Rocko's Modern Life . Angry Beavers . Catdog . Tiny Toon Adventures . Looney Toons . Sesame Street . Arthur . Dexter's Laboratory . The Powerpuff Girls . The Magic School Bus . Digimon 01 and 02 . Pokemon (though, I still watch it from time to time!) . Hey! Arnold . Teen Titans . Boy Meets World . Clarissa Explains It All . The Fairy Oddparents . Spongebob Squarepants . The Grimm Adventures of Billy and Mandy . Ahh! Real Monsters . Gargoyles . Pepper Ann . Recess . X-Men Evolution
I'm sure there were so many more (I was a TV junkie kind of kid), but those were the ones that I really stuck to. Others I'd just watch if it was on.