I’m only realizing now how in the movie, after April passes out and she’s all like WHAT ARE YOU, how spot on each of their responses are.
Leo says that they’re ninjas, because that’s what he’s most proud of, that’s what he focuses the far majority of his energy into. Raph says that they’re mutants, because at this point he’s still hung up on the fact that they’re freaks, outcasts, that whole deal. Donnie says that technically, they’re turtles; because he’s gotta be as logically correct as he can be about everything. And Mikey says that they’re teenagers, because that’s what he identifies with the most believe it or not, above everything else.
It’s just one tiny bit of dialogue but it actually gives a little bit of insight into their personalities; it’s a really good example of characterization and sets the tone for each of them in a way.
I remember I thought this after seeing that preview a couple times!! I’m so happy someone wrote this.