Here is what I want to see:
1. Sakurai to NOT develop the game.
Considering that this is a fighting game, it's inherently competitive and we cannot have someone working on it who has an opposite philosophy. It's like trying to make Manhunt not violent.
2. No similar/clone characters.
Either declone them completely or make them alternate characters which brings me to my next request.
3. Alternate characters.
This would solve the issue of clones and it would also let other characters be playable. Basically, these characters exist underneath other characters. These alternate characters have their own name and voice. Now, we no longer have only pallet swaps.
4. Bring Mewtwo back.
Nuff' said. I don't care if he's alt., just bring him back.
5. More accurate movesets.
This is mostly applying to the MOTHER series since the only move that either the kids learn in their own game is PK Flash. However, this also applies to other quirks such as Samus having a flame thrower and having the grappling beam coming out her gun when it now comes from her left hand.
6. Add more girls.
Brawl did not add any, excluding Zamus, and there is not enough representation of the girls. Paula, Kumatora, Midna, Captain Syrup, Mona, Ashley, Jody Summer, Lip, and more are viable fighters.
7. Have the designers not think that a character wouldn't work.
By Sakurai's logic, we shouldn't have an AC character. Considering that none of the stuff in SSB makes no sense, this is no different.
8. Add some retro and Japan-only characters.
They show some diversity in the roster and Nintendo can use this an opportunity to see if a demand is sufficient for a revival or bringing a game outside of Japan.
9. Let the fans submit movesets for characters prior to the roster is decided.
This gives characters a chance when they have movesets that might be hard to make up.
10. Be more careful on the trophy descriptions.
In Brawl and Melee, there have been a number of inaccuracies such as Wolf knowing James when that has never been said or implied. Instead, let the development teams who handle each series write these descriptions.
11. Be diverse in trophy selections.
Brawl had mostly trophies who were just straight 3D rips. This ended up with the list consisting of trophies from recent games and not the older games, retro or not.