Nice video, here are my thoughts:
#10 Waluigi - He should stay as an assist trophy and a costume for Luigi, that's it.
#9 Bomberman - Would be quite cool but it'll be hard to make all his moves different. MIght be another good assist trophy.
#8 - Baby Bowser - Actually would be really cool. He could be a move-clone of Bowser but work in a completely diff way, like Ganondorf and Captain Falcon (only make it so he doesn't suck). Really like this choice.
#7 - Goemon - Floor-humping-crawl-thing is awesome but I just don't want him in it. Don't know why. Sorry.
#6 - Little Mac - Could def work but would need a lot of work making his moves different, same problem as Bomberman. Liked him as an assist trophy.
#5 - Joe&Mac - Looks really cool actually. One issue could be that they are only in 2 games. If they are popular enough then they would work as a character (Joe&Mac just being diff costumes). If they aren't popular enough then maybe another assist trophy nomination.
#4 - Banjo&Kazooie - Microsoft own their rights (thats why its bean "a while" since they were on a nintendo console). Microsoft wont release their rights. The end
They would have been AWESOME.
#3 - King K Rool - It would def be nice to have some more DK representin' in SSB, but I just have no idea what his moves would be. I would like to see this work but I'm not sure how...
#2 - Simon Belmont - Moveset would be the same as Sheik. No thanks.
#1 - Geno - I can tell you love this character, I don't have that affection having not played the game and he looks rubbish. When I first saw the silhouette I thought it was going to be Nights from the Sega games. Geno disappointed me a lot. Sorry :s