Notes: The unknown Icon is supposed to be Chorus Men, but he isn't in my Roster maker files.
Purple Boundary signifies unlockable character, there are less of them here since all custom moves are unlockable and that already makes a lot of unlockable content.
Yellow Boundary is cut DLC.
Green Boundary is miscellaneous DLC.
Red Boundary is Mario DLC.
The arrangement is flawed and it not part of this prediction.