I used to own Mario Party 1, I still have Mario Party 4, 5 and 7, and I -just- got MP8 as an early birthday present.
My sister has Mario Party DS, but I've never really been interested in that one.
MP1, 4: Mario
MP5, 7, 8: Toad (if not him, then Mario)
And toad for MP DS as well.
For MP9, I'm stuck between Toad, Koopa and Shy Guy. Now, if Koopa (or Shy Guy) had something unique in them that established them as an actual, specific character (ex. Kooper), then one of them would be my favorite.
My sister has Mario Party DS, but I've never really been interested in that one.
MP1, 4: Mario
MP5, 7, 8: Toad (if not him, then Mario)
And toad for MP DS as well.
For MP9, I'm stuck between Toad, Koopa and Shy Guy. Now, if Koopa (or Shy Guy) had something unique in them that established them as an actual, specific character (ex. Kooper), then one of them would be my favorite.