If TMNT 1990 Was a True Trilogy

[RaphaelinSTL]

While technically the first three live action films are within the same continuity, it's easy to tell that each film from 1990 until 1993 have totally different tones to them. While over in the TMNT1990 discussion thread, some fellow original film lovers and I were discussing the possibility of what they would've loved to have seen if TMNT II: Secret of the Ooze would've kept the tone, atmosphere and perhaps the original designs from the first film.

I want to pose the question now to everyone else and let's get a discussion going on this subject alone! Let's say 1990 was a completely different time and the success of the first film allowed New Line Cinema giving Steve Barron the same amount of artistic control and the chance to create two more films with all of the same designs and actors. With no soccer Moms getting in the way with needing to change the amount of violence and darkness from the first film, what would've been your ideal story and theme choices for the follow ups to the first Teenage Mutant Ninja Turtles film?