Am I stuck in a boy band?

By that I mean, am I stuck with Gladiolus, Ignis, and Prompto as my party members? It's not that I dislike being around them, but after being in a party with Iris and Aranea, I realized they were quite helpful. But unfortunately, good things never last and they left my party.

Is there/will there be a way (after I complete the story, perhaps?) to have people like Aranea or Iris join my party? Or am I stuck in my bro squad?