I never deeply got into a animated series tbh. I just watched whatever was animated as a kid. But there where a couple I was really really really into:
The already mentioned "Ed, Edd & Eddy" was definately one. You simply have to love those 3 crazy bastards and their plans to screw the entire neighbourhood.
Well then there where also these:
"Danny Phantom"
"The Avatar"
and "Samurai Jack"
PS: Thats a full episode. That black "Samurai" is what I always imagined Blackbow to be like irl.