Any and all attempts at time travel in the KMV have been rebuffed by it coming under what would normally be the Hyperspace is a Scary Place trope, as well as it being extremely difficult to come close to already. Considering the one mad scientist who made a serious try at it went further insane in a much less useful and more mad-from-the-revelation fashion and had to rely on a malfunctioning backup system to restore what was left of her sanity*, it’s not exactly going to be a common storyline concept anytime soon.
This does indeed retcon Apocynthion pretty badly, but considering that’s all after the point when I lost all ideas I don’t mind a bit…
[* Yes, this implies that Darian can become more insane than she already is--]
In KMVRPG, the battles against Julien, Serena and/or Darian all have different versions of the same rough melody/theme (or possibly each theme is just a third of a larger song, I’m not sure); “Reconstruction”, “Psycho Gear” and “Outer Heaven” versions respectively. Still no idea what the overall theme is called or what it sounds like, though… not like that stops me from rambling about it.
Also the amount of Bonus Bosses the KMVRPG appears to be having is pretty ridiculous. Almost half of the game seems to be bonus, probably in some sort of postcredits “hay walk around the world you saved for fun for a bit” way.
At this point it’s probably safer to just assume any given character in the KMV started out as a reference to something. Because basically everyone from both Sigeki and the Sphere has some sort of internal referential core, although a mostly ineffectual one. It’s only beyond that where things get more ‘whatever was in my head that day’…