I know I'm late on this, but:
No Mii: HELL YEAH!
No Takamaru: Meh.
No Ridley: I'd be upset and disappointed. I wouldn't be seriously angry though. I'd probably get over it pretty quickly, though I'd still be upset because a countless toobiggers/toobigots will become total ***holes and continue to insist they were right no matter what.
No Pac-Man: Couldn't care less about him not being in.
No K. Rool: I'd be rather upset, though less so if we at least get Dixie.
No Palutena: Ah well.
No Isaac: Don't know enough about his franchise to care very much about him missing out.
No Little Mac: Upsetting. Everything I know is a lie.
Sorry, I am just responding to you to reference the options.
No Mii: This would be a delightful surprise, I have come to accept the notion of Miis in Smash. I do not think that it will be inherently bad as many insinuate. What would be more fun than having an epic duel between Hitler and Jesus? Nothing. The roster would maintain a more professional tone without them though, that is much more ideal.
No Takamaru: I have no problem with this, he doesn't pertain to my interests and I prefer to keep exclusive characters out of the game as much as possible. There are better choices that are popular in more than one region.
No Ridly: Doesn't matter, I am not necessarily expecting him.
No K. Rool: Same as Ridley.
No Palutena: This would be a detriment to the roster in my opinion. Hopefully a suitable Kid Icarus representative would still make it in the game if she didn't. I feel as though the series has a great chance to introduce a new character. Palutena is actually one of my personal requests.
No Isaac: I do not know much about him either.
No Little Mac: I would probably commit suicide
(not really though).