S is Suddenly my least favorite letter.
You
Started it.
But really, if Captain Falcon and Ganondorf are still clonish of each other after 2 games, I wouldn't get my hopes up too much for Shadow. Maybe he'll have a couple of different Specials, and a different Final Smash. But I really don't want him in anyway.
So now I'm on a hating tour anyway, here are characters from specific series I really
don't want in:
Super Mario: Waluigi. Nuff said. Also Dr.Mario obviously.
Donkey Kong: DK Jr. Would stand in the way of K.Rool and Dixie's inclusion. And he's already in basically. Cranky would be a better choice as a 'retro' character, literally.
Zelda: Kinda against Tingle, heavily against Sheik if it means she's coupled with Zelda again (but really: you cannot expect Sheik being her own character). I also don't want Toon Zelda / Toon "Sheik" obviously. Also: Fat Impa and Young Link (if it doesn't include him with a Majora's Mask style)
Pokémon: Any other Gen. Pokémon Trainer character. Keep the starters unique with Squrtile, Ivysaur and Charizard please.
Sonic: Shadow, but I'm not exactly excited to see any newcomer from Sonic. Maybe Tails though, as I kinda like Tails much more than Sonic.
Metroid: Only Dark Samus I'm opposed to. Or anything that stands in the way of the
MANLIEST available character for Smash:
MANTHONY HIGGZZZZZ
Fire Emblem: I'm not against ANY Fire Emblem character honestly. Chrome is still the most likely character, with Roy as a second, so there's not really much else.