It's still Zombie Island for me but Witch's Ghost, the 80's trio and the Courage crossover comes close
Super Mario Boards
R.O.B
DarkAdorable
I haven't watched all of them, but I do have fond memories of "Zombie Island", "Alien Invaders" and "Cyber Chase" (the latter one was one of my first DVDs in Christmas 2001)
Cowardly Coyote
Remember watching Cyber Chase and I think Zombie Island and/or Alien Invaders. There's a couple others but those immediately came to mind. There's plenty I haven't watched, though.