first try was the urchin. his way of messing with the player is interesting, but it would be cool if i could see where he is going to place a block instead of it materializing there so i could maybe prevent it and can be more pro-active that way.
2nd one i don't remember but he inverts your controls
3rd one was the ghost. this one can fuckup your whole board if the shuffler isn't feeling like giving good pieces.