I wish there were epilogues for Kasumi and Kei's routes. Like, Kasumi's is pretty much a bad ending entirely, but I'd be interesting in seeing what exactly Mercurius does at that point seeing as Ren fucked up all his plans by being a jobber, and if he and Reinhard just rape each other for the reset.
For Kei's route, I'd want to see what kind of Atziluth Ren could manifest with his new Holy Relic/philosophy and have another branching happy ending in the multiverse for Kei