Donkey Kong Country
I used to watch this all the time on cable in the late 90's. Most episodes had King K.rool trying to steal a crystal coconut, with characters breaking into song at least once in an episode. Looking back the show wasn't very good, I think I just watched it because it was something to do with Donkey Kong country.
Earthworm Jim
Channel 4 used to show this Sunday mornings in the mid 90's, so this would be the first thing I watched at the weekend for a couple of years. What I liked about this show was that it constantly broke the 4th wall, with character talking to the audience and poking fun at what was happening. This show has aged very well, still funny today. Fun fact: Earthworm jim himself was voiced by Dan castellaneta (voice of Homer simpson).
Kirby: Right Back at Ya!
I used to catch the occasion episode of this back in 2004 on Fox kids, I don't know why I like this show, maybe because its unashamedly goofy in what its doing. I really liked that Nintendo gave this show its own channel on the Wii!
Captain N and the Mario bros cartoons were also favorites of mine.