@DeefMD They would likely live in a fictional city called Mirage City. Let's take Shazam as an example; Shazam's original comic book publisher was Fawcett Comics, but after DC acquired it, all the Shazam characters were reintroduced as residents of a fictional city called Fawcett City, named after their original publisher. The same formula could be used for TMNT. A fictional city called Mirage City could be created in honor of their original publisher, Mirage Comics, and the TMNT characters could be reintroduced as residents of this fictional city.