Okay if I had to say seven people who would be my picks to join they would be these ten

1 - I think that we should keep Lucario in the game and add in Zoroark since people like drawing them a lot for many reasons.
2 - I also would love to see Lloyd Irving from the Tales of Symphonia series in the New Smash Brothers game. Lloyd was really cool if you ask me.
3 - Lyndis from Fire Emblem more known as Lyn. We can see she was in the last one as a trophy so she has a chance of being one.
4 - Lets take out the Pokémon Trainer and maybe let Mewtwo or even his new form. Lets face it we miss him right?
5 - Roy! I miss that guy so much. He deserves better then just being dropped after just one game!
6 - I say maybe take out Wario and then put in Bowser Jr or Waluigi because to me Wario wasn't that good.
7 - Blaze the Cat from Sonic Rush. Lets face it Super Smash bros is good but there are only three females in the game. Wouldn't it be cool to have Blaze as a fourth female.

Those would be the seven I like to see join and the few I would leave.

renthec : I'd like to see Pit and several characters from Kid Icarus: Uprising, most notably Phosphora. Link, of course, and Isaac or Matthew from the Golden Sun series. Zelda/Sheik need to make a come back, and Toon Gannon would be fun. Maybe even Toon Zelda.

Costume mario
Mario usually only uses the tool power ups in the game
but we could have a separate one doing tanooki, frog, or even bee mario
the special could be the star power up

i would like to see shulk from xenoblade in the game. Now that would be something. he would make a great character. 

Shulk from xenoblade would be a great idea and I would also really like to see geno/malo from Mario Rpg. And with the addition of megaman in it, Zero would be a cool addition so we have both the original and the reboot of the series in it. And my last hope would be little mac. He's pretty cool . If you don't like these guys, then whatever, I'm sure they will have someone you like added.

They said they're gonna work with other companies. In that case, capcom's Phoenix Wright would be more as welcome.

I would love, and it is incredibly likely, to see Little Mac from Punch Out. He would be perfect for the game.
Chrom from the new Fire Emblem game would be a good one as well, but has the problem that he would play a lot like Marth does.
If Sonic is staying in the game, Shadow would make for a good character, using all of his chaos attacks.

Other companies? What about Pac Man then? I would love to see what they could do with him. 

OMG what if they put a mlp character in the new super smash bros game. It will make it a lot better. That my opinion though. Dont judge me.

Girahim. And his final smash can be:
1; A horde of goblins attacking the players or
2; If someone is in front of him, he disappear and appear again behind the other player, and he lick his ear so the poor character jumps scared and disgusted going off the screen.

Other option can be Knuckles or Blaze. Knuckles can have much force and a final smash when he uses the Master Emerald to charge a beam or transforms himself into Super Knuckles. Blaze can create fire columns or transforms into Burning Blaze (Her super form) instead for the final smash

I would like to see Jimmy lee from double dragon..
Or..Ryu from ninja gaiden if it already exist..

I want this characters:
-all the characters of super smash bros brawl and melee
- shadow
- pacman
- crhom
- lucina
- tails
- knucles
- darkrai
- zoroark
- raichu-
- the pokemon trainer of hoenn

Without a doubt I would to see Midna (real form) also Waluigi he was my fav. character to chose in the Mario Party series and I would like to see a new trio of starter pokemon for pokemon trainer.

Personally  no I would not like to another Super smash Bros but they are already making another one and they added some new characters, Megaman and the guy from either harvest moon or animal crossing and a Pokemon(maybe). To me another one isn't necessary because super smash bros is the same in every game to the title and it has no story line to it or a real purpose of playing.

I want to see someone like Lyndis or Joshua playable from Fire Emblem, I want to see them use that series more, I know the already have a lot for it's popularity but they have left so many characters untouched from the series, I mean they could make a whole franchise of fighting games off of it. Honestly I wouldn't mind Franz from the Sacred Stones either, Don't know why but he's a beast.

Well, 

Replace Lucario with Mewtwo
Add Pacman
Add Banjo and Kazooie
Add Sora
Have a mode where you can play as Master Hand and Crazy Hand
Take Wolf away
Bring Roy back, but keep Marth and Ike
Be able to download new characters from online

That's really all I'm asking for.

I would like to see Shadow Mario from Super Mario Sunshine in the new Super Smash Bros. A fight between him and Mario would be very interesting.

i would like to see goku from dragon ball z 

Well I am not sure yet but if shadow is not in it I would like to see him in it