I will go for.
Same as SSB on Wii
with the following differences:

no game and watch guy but I like the Ballon fight guy
Xenoblade guy will be so hot to play
Exclusive Lara croft and not Snake
Bayonetta 2 characters (at least 2)
Metal Mario
Impa no Zelda
Ghirahim No Ganondorf
Demise
Paper Mario
Bowser Jr


of course Mii at least for online players with ability to be gained during fighing with other people or during the mission!

The new characters I want to see:

Chrom, a female character from Fire Emblem, Takamaru, Paper Mario, Dixie Kong, King K. Rool and Shulk. And as for 3rd party characters: Bomberman, Mega Man and Kos-Mos (with Sonic returning).

The characters I want to see return that weren't in Brawl:

Mewtwo (with Mew as alt).

The characters I would remove to add the new ones:

Lucario, R.O.B., Ike, Snake, Lucas and Falco.

And Dark Pit as Pit's alt. So, in total, 40 characters with 4 or 5 alts... Hopefully that's reasonable enough...

No tripping
No items
Fox only
Final Destination

Iwata? Dropping bombs? Yes please.

how about samus and nina tag?