I posted this over on GameFAQs, but I'd also like to put this here in case I get a clearer/quicker answer.
I've just finished the huge event in which Nihilo attacks the Mantra HQ. I'm curious about endings, though.
I know for the Neutral ending I need to say yes to all questions in Yoyogi Park. I know for the other endings, save the True Demon one, depend on my actions in different areas before the final dungeon. I also know for the True Demon ending that I must complete the Labyrinth of Amala.
However, which flags override which? Can I answer yes to the questions in Yoyogi Park but go activate another Reason and get a different ending? I know the True Demon ending overrides all endings.
Also, how short are these areas that allow me to choose the ending? Do I go in and see a short event before the last dungeon...? I'd like to save just before Yoyogi Park so I can see all the different endings, but I'm unsure of how much more gameplay that would take.