Sorry everyone, I'm not feeling very good and there's still a few things I want to figure out, so I'm going to get the first post up sometime tomorrow rather than tonight.
Anyway, just checking here: Mizuki (Misterica) and Sara/Artemis (myself) will be together from the get go since they know each other from university. Venice (Latooni) will latch onto them after the mirror reveal. Akira (Wolfie) will join sometime later after a few encounters with the group. The main one I'm not sure about yet is Sessha's character, but he's indicated he's still interested in playing.
Hiroko/Robin, if I play her as a second character, will be someone the group rescues later on. (Been thinking of playing Artemis as a glaive wielder so that I don't have two archer characters if that happens, but why call her Artemis is she doesn't use a bow?)