Episode One: The Quest for Apple Pie!
Characters: Kirby, Link, Louie
Battles: King Dedede, Joker, Bowser, Crash, PAC-MAN, Enderman, Wario, Sephiroth, Louie
Synopsis: A very hungry trio - Kirby, Link and Louie - have been baking a delicious apple pie in Kirby's house all day! (Even if Louie has been trying to sneak bugs into the recipe wherever possible.) However, with the apple pie finished and cooling off on the side, a knock is heard on Kirby's door! Whilst all three of them are distracted... the apple pie has disappeared? Where could it have gone!? Setting off in search of the apple pie, the trio go on a quest to try and find once and for all who took it, or where it is - following leads or advice from each person they do battle against on their quest. They first visit King Dedede given his history of stealing food, but he's apparently got nothing to do with it... maybe it could be another thief of some kind? After travelling from place to place with seemingly no end in sight, and even fighting Sephiroth, they end up coming up empty-handed... but the very last battle reveals that Louie stole the pie for himself at the very beginning! H-how could he?!
Final Boss: Heavyweight Louie (Louie, but significantly heavier and heavier-hitting than normal. Basically, "Metal Louie", but without the metal effect. Presumably, he ate the WHOLE PIE all to himself. How greedy!)
Additional Notes: I feel like a more light-hearted story would work pretty well for the first Episode, and it's a good way of introducing players to the concept without raising the stakes too high from the off - whilst also allowing different characters to be introduced in a slightly comedic fashion, and poking a bit of fun at different elements of the games being referenced (like the Enderman's tendency to pick up blocks potentially being mistaken as kleptomania, the Kirby series' tendency to have final bosses against god-like beings, and Louie's deceptive nature). Plus, it shows off a variety of different worlds in the process!
That said, there's a couple of big players here too, setting up future Episodes in the process. Maybe Bowser's busy overseeing the construction of a Super Airship, for example, and he's slightly annoyed that the trio are bothering him - that could set up a fun future conflict. Plus, Kirby, Link and Louie being a trio sort of works gameplay-wise - Kirby's really approachable as a newcomer, Link's a little more complex but still understandable, and Louie's a little more cerebral, which interestingly kind of fits into how he's kind of the traitor of the group. Plus, each of them are related to cooking in some way - Kirby has a ravenous appetite, Link's BotW/TotK series features cooking as a central mechanic, and Louie's constantly eating bugs.