I'm not sure what spawned this idea, other than the talk of Wild Arms in the random encounter thread, but, I've been giving some thought into what the Temple of the Spirit would involve. I'm mostly thinking about Wild Arms 2's Heimdal Gazzo, but, the idea of having a dungeon where the party has to split up and flick switches in order for a different party to proceed is what I'm aiming for. I'm not sure if encounters are going to be a thing, but, I'm figuring there's going to be a boss-thing after the party reconnects with each other.
Also, the idea of the trial being full of illusions that trick our heroes in some way, but, I'm not quite sure what, exactly, that will mean in the context of the dungeon. Maybe I'm thinking about the Rakshasa episode of Kolchak, but, it could mean seeing a loved one, or somebody one knows or trusts that is actually a nasty-in-disguise luring one to one's untimely death. Though, perhaps, in the case of Kenshin, they are there to further torture his regrets? On the other hand, maybe it just means that there's hidden paths that takes a keen eye to see? How would I even pull something like that off in RPG Maker? I have no idea!
I've barely come back to this, but, the thought-process is more along the lines of spirits who take the form of a trusted/loved individual. So, for instance, when players control Hiroji, he encounters a spirit that takes the form of Gojo Sakura. It depends on how many doors he gets through before the encounter happens, but the spirit can easily claim that it knows the temple better than he, and knows of secret ways, and attempt to lure him that way.
As for the other two, they are less certain as to who they could encounter. The thought is that the Oracle encounters Kenshin for real, and Oharu encounters a faux-Momo, or maybe a faux-Queen-of-Askigaga (who is supposed to be dead).