On Beat-em' ups and 80s/90s properties.

 Teenage Mutant Ninja Turtles, Mighty Morphin' Power Rangers, GI Joe, Karate Kod, now He-Man and the Masters of the Universe have entered the 2D Beat-em' up game. 

Transformers have the 3D Run and gun games like War for Cybertron and Devastation. But there are other properties tbar could work on this genre:

Let's start with the obvious one:

Thundercats:

Decent sized cast with plenty of enemies, especially various generic mutants. There are plenty of enemies for a basic game, additional enemies for DLC and sequels.

Characters like Willa, Hachiman, and thr Snowman as DLC. No, SUGGESTING A BLACK SCREEN LYNX-O MODE, would be a dick move.

Silverhawks:

This one sounds like is perfect for a beat-em'up, but the Mob lacks generic members for it to work as a beat-em up. The game should be mostly a clone of this:

Where the Silverhawks chase down Mob members then once they disable the getaway vehicle, the game turns into a brawler where the Silverhawks have to fight one of the members of the mob.

Tigersharks:

I vaguely remember the show, but it would probably feel like an underwater reskin of Silverhawks.

But it could be made different by perhaps making it a half 2D side-scroller half beat-em'up game.

The first half loosely inspired by

The second half, a beat-em'up... 

The Adventures of the Galaxy Rangers:

I Vaguely remember the show. Mostly the theme song.

I know galoob made the toys, but I don't know if Hasbro has the rights.

Disney's Gargoyles:

The Old SEGA Genesis game was good. But there was no love for the rest of the Manhattan clan.

A Beat-em'up! Game with flying elements.

Captain Planet and the Planeteers:

The game would be a standard beat-em'up! starring the Planeteers. Captain Planet is not playable. Period. Captain Planet would be the finishing move for each boss. The caveat is that the more players playing co-op , the less Energy you need to charge to summon Captain Planet.

You're soloing it as Ma-Ti: you'll need 5 Super charges to summon Captain Planet.

Playing with 3 Planeteers? A little bit over 1.5 super bars is all you need.

My Little Pony: Friendship is Magic:

Hasbro wouldn't have the guts, but it's doable...

Jem and the Holograms:

This was a game that should've come during the Rockband and Guitar Hero Craze.