I would LOVE to see this game hahaha
It’s a bit disjointed, but I’m sure I can scrape together a plot.
First character is avatar mii Swordfighter. Let them pick another Mii from their system to be their “rival”. Opening tutorial of battle system as mii vs. mii combat. Make this combat cause something nonsensical to occur that causes Tabuu to become unsealed and break some smash brothers dimensional boundaries. Creating havoc and unpredictable Smashed Dimensional Shards across the multiverse. One of these teleports player character to Donkey Kong Country where he meets Donkey Kong who is beating kremlings for kidnapping his family, they tackle some Kremlings and a Kremling mid boss (one of the named ones from Barrel Blast. Make them do flying attacks from that game). After defeating him they burst into what they expect to be K. Rool’s throne room.
Where they see a Roboticized Metal K. Rool being backed up by metal diddy, dixie, kiddy, chunky, tiny, lanky, cranky, and funky (eight worlds after the prologue. Perfect)
Player and DK fight K Rool, beat him, Metal Kongs join in, forced loss.
Smashed Dimensional shard appears and looks like it’s about to white out over every character it seems to stabalize as Palutena appears. She joins the party, causing the metal kongs to use a different shard to escape.
Palutena gives the party a couple of game breaking mechanics. Limit break type stuff. Combo attacks in xenoblade, whatever mechanic is appropriate to introduce here.
World 1: Metal Lanky and Lemmy Koopa’s circus of doom (after defeating becomes Lanky and Lemmy’s circus of fun and houses minigames that unlock game breaking equipment and summons).
World 2: Skyworld. To help her find Pit, Palutena hires Samus (and proceeds to argue about the whether Komaytos are Metroids). Metal Dixie has stolen the powers of Ares to become the knew Goddess of War (pause for laughter just like you would in Kid Icarus Uprising). Defeat this flying terror after Palutena gives you the power of flight to save Pit. Only to find out you’ve saved Dark Pit (Viridi says thanks). Palutena reminds Samus she’s still under contract until they find Pit, gives Dixie Kong the power of flight to act as Pit until they can find him (Ares is not happy, but also unwilling to challenge Dixie Kong again). Heroes move onward. Samus’ airship lets you dimensionally backtrack to Lemmy and Lanky’s circus of fun.
World 3: Metal Cranky’s retro terror. Chase Metal Kiddy through enemies of Donkey Kong’s arcade history including, Donkey Kong Jr. (who will be able to attack with math), Stanley the Bug Man, Jump-Man, Pauline, crocodiles, and so many barrels to have to out platform the scrooge like pogo-ing metal cranky himself.
World 4: Metal Funky’s Sports festival. Chase down Metal Funky through this next world themed around Pilotwings, Steel Diver, and Waverace. Rival shows up again. Dang rival.
World 5: Metal Diddy has apparently completely taken over Mobius (or whatever we want to call sonic world) and Sonic has been nigh bled dry by a Robotocized Metroid. Heroes save Sonic. Sonic joins the team. Now we have a full party. Samus says what a dangerous threats robotocized metroids are. Eggman finally reveals himself as seeming big bad of the game. Samus says Eggman’s technology combined with other life forms from Zebes or Skyworld is incredibly dangerous and must be stopped. Outrace Jetpacking Metal Diddy to at least stop Eggman’s home operations from supporting what he’s doing across the dimensions. Heroes press onward, sonic decides to remain with the party
World Six: Metal Tiny’s Pikmin Dungeon. Shrink down to stop Metal Tiny from giving Eggman an endless robotocized Pikmin army (Secret DLC character: Olimar).
World Seven: Zebes Boss rush.
Metal Chunky brought much of Eggman’s plans to light. Heroes have to get past metal kraid, metal phantoon, metal mecha ridley, metal mother brain and metal Chunky Kong to be able to finally get to their showdown with Eggman.
World Eight: Rival Party: Eggman’s made a rival version of your party. metal (your chosen rival mii), metal kiddy kong, metal dark samus, metal pit (not really what he wanted for palutena, but it’s where he’s been this whole time) and Eggman himself!
Defeat them for Eggman Form 2.
Eggman’s head springs off Dr. Wily style.
Reveal the real bad guys of the game are Metal Sonic working with Dr Wily. And they are trying to robotocize Tabuu. This spectacularly backfires, players defeat Metal Tabuu.
Ba dadada, A winner is you.