Street Fighter is going to get the Secret of the Ooze

 Teenage Mutant Ninja Turtles is invading Street Fighter 6

It's mainly World Tour crap, BUT since they're making actual Turtle models, they could add them as additional guest spots, maybe even give them unique move sets. There are plenty of characters that they can borrow moves from. 

Warning: the following are just ideas and speculation on how they could make them into actual characters and nothing official.

Let's say their basic moves set could be Ansatsuken-esque with Leonardo being more Ryu-like, Raph being more Ken-like, Mike being more Dan-like, and Don being more Sakura-like.

By that I mean that The Hamato style has 4 variations: Leonardo, like Ryu follows a rigid version of the style. Raphael does a more aggro version of it. Donatello's style is not as polished as Leonardo's but it's functional. While Michelangelo's looks like a complete joke, but when used properly it can punish.

For specials, they all get a Kunai toss.

-Leonardo can use a Genki Charge type move that can make his kunai explosive.

-Raph gets a Sonic Cross type move where he can fire 2 kunai in a row.

-Don throws a smoke bomb that "blinds" the opponent for a second (little to no damage)

-Mikey throws shuriken.

They all get a "tatsumaki" type kick where Leo's is the default version. Raph's is a more aggro and flashy move that moves upwards at a slight angle. Don's moves at an arc. Mikey fails miserably at the move, but his pratfall can hurt the opponent. (Kick button determines where he'll fall and his shell does more damage.)

They get a few unique specials with their weapons.

Leo:

Rising Turtle: a shoryuken type move where Leonardo uses his sword to attack. (Weak hits with the pommel, medium the blade remains close to Leonardo's arm and strong has the blade perpendicular.  Strong version has a weakness where you're prone to receove more damage if the opponent dodges and counters)

Don:

Poke and slam: a move where don does a poking attack where he slams you to the ground or flicks you into the air after connecting.

Twirly shield: a move where Don twirls his staff, can deflect a projectile or work as an anti-air move if timed right

Raph:

Brooklyn Rage: an attack similar to Sodom's Jigoku scrape.

Sai drill: a Drill Claw type of move

Mike:

Pizza Time/Dragon Breath:

Mikey eats a slice of Pizza that either gives him a random amount of health or it causes him to burp a noxious cloud.

Ninja Vanish: 

A "teleport move" that allows Mikey to retreat. Distance depends on button. Has a 1/60 chance of failure. If it fails it increases the chances of a large health boost in the next Pizza time used before the round ends. 

But first we need to see how this will roll out, is it free or do I have to pay?

Update:

I DO Have to pay. 750 Fighter Coins per Turtle Outfit... that would be about $77+ applicable taxes to get all four.