I'm hoping both Pacman and Mii DON'T make it into the cut.
I'll be honest here, there is only one reason I don't want Pacman in, I hate Pacman, the new one anyway, he's nothing more that a yellow abomination with a big mouth and an egotistical peronality. In fact, he's pretty mcuh what I envision when I think about the mutated charcter in the novel "I have no mouth, but I must sream"
Mii's however, have more legit reasons not to be included. For starters, in a game like Smash, which is breeming with personality, Mii's are hoolow, persoanlity-less, analogs of peoples faces (and poor ones at that), besides haeing a changable coloured T-shirt, there really is nothing unique about these guys, putting them in would simply be a wasted oppurtunity spedning time on a more unique and wanted character in game.
The second reason is that we already have villager, who dispite his psychotic tendencies, is basically a much more fleshed out, 3-D (both metaphically and litteraly) version of Mii anyway, so why would you waste so much effort developing a second rate Villager?