Mario Franchise
Peach's Castle (Switch): This map takes place outside of and in Peach's Castle from Super Mario 64. Different from Melee and 64's version, this map is a travel stage. It starts you outside of the castle, with a simple flat fighting area, and then takes you to the foyer, and it'll then take you all around the different rooms of the castle.
Zelda Franchise
Divine Beasts: In this map, you fight across the backs and sometimes inside of the different Divine Beasts of Breath of the Wild. You start out on Divine Beast Vah Medoh, who is currently flying with you on it's back. The harsh winds force you backwards, similar to the Meta Ridley fight from Brawl. It'll then fly you around the different beasts will you will fight for a limited amount of time. Each one will have unique things, such as Vah Rudania slowly hurting you over time from the heat, or Vah Naboris having electric spots to avoid, and Vah Rudania firing water which will push you back forcefully.
Kirby Franchise
Dedede Arena: Fight in the Dedede branded boxing ring from Kirby's past battles with his rival. Similarly to Boxing Ring the Punch-Out Stage, you can jump on the rings. Unlike that stage however, battles are limited to the ring. There are no walkways to fight in, and no light on top. The crowd around the arena is filled with Dedede's minions. It can be hard to recover or fight off the stage because going low hides you in the crowd.
Pokemon Franchise
Altar of the Sunne/Moone: A map similar to Spear Pillar, where legendaries show up. This map takes place in the altar of the Sunne (For Pokemon Moon) and altar of the Moone (For Pokemon Sun.) It is a basic flat platform with pits on both sides, kind of like most Omega maps, but a little wider. Like previously mentioned, Legendaries and show up in the background. if Solgaleo shows up, he will roar and give all players his Full Metal Jacket, otherwise known as basically just making everyone metal. If Lunala shows up, it focuses a Moongeist Beam, which is a giant laser that hits the screen. Since Lunala is in the back and Lunala shoots forward, not only does the beam hit anyone in the middle, but it also blinds players in the middle of the screen, because the beam is hitting the screen. If Necrozma shows up, he quickly dashes away, leaving the stage in darkness for a little while.
Metroid Franchise
I will admit that the only game I've played so far in the franchise is the original, and I never even made it to the first boss. Soo... I'm idealess.
Donkey Kong Franchise
To have two empty-handed stage submissions in a row sucks. Anyway, I've played tons of Donkey Kong games, but no unique stages that haven't already been widespread before are coming to mind...
Pikmin Franchise
End of Day: A map that takes place on the S.S. Dolphin, a Red Onion, a Yellow Onion, and a Blue Onion flying away into space, just like the End of Day in Pikmin. The S.S. Dolphin may be small, but it is the main platform, as the Onions are constantly flying around, sometimes even going in the background Jungle Hijinx style.
Mother/Earthbound Franchise
Twoson: The town of Twoson is, unsurprisingly, the second town you visit in Earthbound. It takes place on the road inbetween the Flea Market and the School, and the flea market and school if you've ever played the game. It's a decently large horizontal map, with no ledges. In the flea market area, you can jump off of the tarps and stuff. The school is just an everyday building that you can stand on. Since the bike shop is in this town, a hazard could be people riding bikes down the road.
Fire Emblem Franchise
War: I don't have many ideas for this one other than it's an active war.
Animal Crossing Franchise
Main Street: It's the Main Street from Animal Crossing: New Leaf! Fight on the roof tops of the buildings, simple as that. If you've played Animal Crossing: New Leaf, you may know that the rooftops could pose an interesting battleground, but if I tried to explain it all here it would be complicated and unfun to read.
WIP! I will work on this more later