List of canon franchises represented in the series

They are a lot of franchises represented in the Battle of the Multiverse Crossover Collab series. Of course, minor cameos or characters do not count. They are only cameos and/or minor characters that have nothing to do with the series.

Mario
Arguably the mascot of the series, Mario and his home series is also in every media possible. Mario would also be in the title in some movies or games.

Sonic
A popular franchise, the Sonic franchise is a popular franchise. Despite Eggman not joining Bowser in some games or movies, he and Bowser are close friends.

Kirby
Another mascot of the show, Kirby is a popular icon. He would be in almost every game, piece of art, and movie though he’s a bit short on the episodes.

SpongeBob
The mascot of them all, SpongeBob is the most influential show in the series. SpongeBob doesn’t appear in games or movies (or at least as often as the others), he does have a decent appearance in the episodes.

Happy Tree Friends
A show that doesn’t really show up in any movies still got a decent appearance in artwork and tv episodes. It even got it’s own spin-off series called ”Happy Tree Friends Adventures”.

Super Mario Logan
A show that is actually represented on how episodes are made. Any episode that are in plush form takes place in Super Mario Logan.

Carl
A rare show that only appear every now and then. It stars the life of Carl And his friends.

Sesame Street/ The Muppets
A series that is actually represented through memes. Elmo and Kermit would be the most popular.

Family Guy
A show that is fairly common in the series.

The Simpsons
Another show that is adult themed, though it’s a bit more tame and it’s somewhat also aimed to kids as well.

South Park
A show that a is show that appears somewhat in the series.

Pokemon
Mostly is seen with the villains due to Mewtwo but Pikachu and a few other Pokemon appear in the series too.

Dragon Ball
A series that isn’t terribly common but Goku does appear in the Super Smash Flash games and in artwork, he does appear alongside Spongebob.