I hope for
paper mario- he would not be a clone of mario, infact, he would use all his moves mainly from paper mario 2.
toad: he has been in every single mario game possible and up to date. if you dig deep enough into mario games, you would make a great moveset for toad Peach can use the same B move, but carry a heart instead.
Daisy: she sounds like a bad choice considering the obvious reasons you don't want her in. but don't you think she would have potential? you see her more of a princess. when I saw her in mario striikers charged, I thought she would be good for the fourth game. she would wear her striker outfit, her sports outfit, or her biking outfit.
Bomberman- he has a great fanbase, I gave him a good moveset, and he is from hudson (which gave support to all mario party games) Bomberman was famous over nintendo and microsoft. ANYWAY, Bomberman had fame a tiny bit like street fighter.
Ryu- sounds like a bad idea, although street fighter is the worlds most famous fighting game in history! Ryu has more than enough potential to have a great moveset.
Mewtwo- he was a great character, you caan also upgrade one of his moves!
items and assist trophies I want
Mona pizza- add an item from warioware! the pizza will be big and 3D. and you can eat it, it recovers 300% damage. if you attack it witrh a sword, it will be cut into 3 slices, each one will recover 100% damage!
thwomp- he would fly like lakitu, when he sees a player below him, he falls on him! player gets pinned to the ground,
skull kid- he would summon the giant meteor, when the meteor falls, its instant KO for anyone who doesn't dodge!, you have a time limit of 40 seconds to avoid the attack!
Rosalina- she will appear, and summon shooting stars to rain down upon youre foes. sometimes, a star will break apart into the stars that make you invincible, or the warpstar.