If another Mario Party was going to exist, I'd think that it would contain the following...
Playables
*Mario
*Luigi
*Peach
*Daisy
*Wario
*Waluigi
*Yoshi
*Birdo
*Donkey Kong
*Diddy Kong
*Toad
*Toadette
*Hammer Bro
*Koopa Troopa
*Boo
*Dry Bones
*Blooper
*Koopa Kid
Board Hosts
*Cranky Kong; hosts a jungle-themed board
*King Boo; hosts a haunted-themed board
*Coach; hosts a water-themed board
*Goomboss; hosts a mountain-themed board
*General Guy; hosts a desert-themed board
*Rosalina; hosts a galaxy-themed board
*Bowser Jr.; hosts a volcano-themed board
Supporting Characters
*Koopa Troopa
*Ukiki
*Funky Kong
*Pink Boo
*Penguin
*Pianta
*Noki
*Goomba
*Shy Guy
*Klepto
*Whomp
*Tox Box
*Luma
*Polari
*Lubba
*Koopa Kids
Antagonists
*Bowser
*Bowser Jr.
*Dry Bowser
*Koopa Kids
Mini-Game Counter
4 Player: 20
1 vs 3: 15
2 vs 2: 15
Battle: 10
Duel: 15
8 Player: 20
Bowser: 5
Bonus: 3
Rare: 2
Total: 105
Controller Support
Wii Remote (side); can't be used in an 8-player game
Wii Classic Controller
Nintendo GameCube Controller
8-Player Controls
Wii Classic Controller
P1, P3, P5, P7: L, ZL, Left Control Stick
P2, P4, P6, P8: R, ZR, Right Control Stick
All: a, b, y, x
Nintendo GameCube Controller
P1, P3, P5, P7: L, Control Stick
P2, P4, P6, P8: R, C-Stick
All: A, B, Y, X