Here are mine:
1. Pokémon Trainer (The concept is awesome and it looks like a very versatile character)
2. Zamus (YOU KNOW! xD But seriously, I like tall characters with range and speed, Zamus gives me that feel)
3. Pit (This little dude looks awesome, the remodelling from the NES era is great. 2 swords, a ranged attack and some extra jumps? Yes, please)
4. Everyone one of the veterans (It's always nice to see the old characters come back with a new enhanced look like Zelda *Rawr*)
5. Assist Trophies (The whole idea is great. It gives characters that would otherwise never appear in the SSB franchise a kameo)
6. The Musicians (No need to explain this one. Yasunori Mitsuda is in there, 'nuff said)
7. Battlefield Redesign (It looks great. And they got rid of those annoying spots beneath the edges)
8. Ike (Just because he wears a cape. Cape = Hero)
Oh my, I almost had forgotten about Snake. :D