As we have known for the longest time, Mario Party 9 will only feature 12 playable characters. We already know the first eleven, but the last unlockable character is still a mystery. Judging off this screen, the players have been partnered together leaving Toad and Koopa as partners and throwing the idea that Toadette is the final character out the window.
Shy Guy is clearly an unlockable character, but who could be the final unlockable? The various space themes shown could indicate Rosalina as playable, but we have yet to see anything from DK, a character that has been seen in every Mario Party game to date. Kamek, someone who was featured in the box art, is also a possible candidate. Who do you think it is?