Just for fun: what superhero catch phrases would suit the Turtles?
 

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Well, when it comes to catch phrases, "Cowabunga" must be the most iconic one from our heroes in a half shell.

But let's talk about Catch phrases from other heroes which would be right at home with the Turtles.

For example, I can so hear Raphael use the Fantastic Four's Thing's catch Phrase.
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Donatello: "Excelsior"

"I'm Batman."

How about "Go Green Machine!!"

Oh wait, they said that in the OT. It still works for them. :)

While its not exactly a catchphrase, I could see 80s Leonardo shouting that the turtles stand for Truth, Justice and The American Way.

Darkwing Duck
 

Donatello could use Darkwing Duck's phrases in the Night of the Dark Turtle episode. (I guess he used Batman's)

And I can see Leonardo using using and the Four Musketeers' phrases even when not believing he is Artagnan. He liked that book.

In my headcanon, it's his favorite book. D'Artagnan was technically not even a Musketeer, but he believed very strongly in their purpose. Much like Leo does in his.

It at least was at the beginning of the episode, even before Rocksteady knocked him.

Here's two more.

I can also see him shouting they fight for Freedom, Equality and Brotherhood (from the French Revolution of 1789), and Michelangelo adding (as usual): and a Bigger Slice of Pizza.

I just wanna see them mention once "Netflix and Chill"

I suppose when Mikey is making a pizza he could say "Flame on!" :D

I could see Raph saying "It's clobbering time!"