I have to try them out first. Also, I'm in grief of the loss of Dry Bones AND Dry Bowser. I can't take it! D:
That said, I have narrowed it down a bit, but I'm still unsure:
LW: Toad, Koopa Troopa or Shy guy
M: Yoshi or Ludwig
HW: DK, Bowser or Waluigi.
Is the complete roster revealed, or are there some more comming?