So here are my 7 things that SSBC 0.9.1 needs:
Returning stages from previous versions: Onett, Mute City, Castle Siege, Planet Flora, Hyrule Temple, Chemical Plant Zone, Planet Zebes, Princess Peach's Castle, Vegetable Valley, Good Egg Galaxy, Big Blue, Pirate Ship, Planet Namek, Fourside, and The Beginning.
New Stages for the new Characters.
More Resprites for Characters and Stages.
Zelda/Sheik.
Home Run Contest.
Event Matches.
Fight against Metal Characters in Classic Mode.
That's it!