Here's an idea for a topic, let's say there's 5 more stages (6 slots with one DLC button), what stages do you want?
I'm not banking on another new series so my picks are
Woolly World, Orbital Assault Gate, Real Life ROB, Royale Avenue/Battle Royale Dome (Pokemon stage), Modern Kirby Stage (can't pick one)
*cracks knuckles*
-Norion from Metroid Prime 3, the gimmick is the ground can break and then it transitions to a 30 second air mode where everyone falls, fall too low or get too high, KO. You can hit the walls to launch back up and recover from helpless states, but it hurts a bit
-Jambastion from Kirby Star Allies, you fight around the Jambastion ship while the Mage Generals occasionally pop in to attack
-Stardust Speedway which originated in Sonic CD, a scrolling stage that scrolls through different speeds depending on the time period, Metal Sonic occasionally shows up and tries to ram into fighters on the path, but like Sonic Generations, there are platforms you can get on to avoid him
-Bowser's Castle, the room itself rotates, so we can see all the fiendish traps throughout the series which can hurt the players, while any inactive characters associated with Bowser, meaning Jr, the Koopalings and Bowser himself, appear in the background to taunt the fighters. Occasionally ascends up to an airship which has cannons fire
-Plains of Passage from Shovel Knight! A nice grassy stage which replicates the pixelart found in the game. It contains multiple Shovel Knight tracks and Black Knight (No not that one FE rans) shows up while riding his turtle thing from Plague of Shadows. Occasionally blocks can appear, which can get a fighter stuck similar to the barrels in Wrecking Crew. The blocks can stack and create walls, but they can be destroyed by players