alright, folks, strap in for another theory rambling from syd: demyx edition
what we know about demyx:
(that's, like, partially facetious but also true. all we really know is that he's connected to some ancient keyblade legacy. on top of that, though, there are some observations we can make:)
his death in kh2 has him in a weird pillar of light only shared slightly with xigbar
i trust him when he says he's not a scientist
his title is the melodious nocturne in en and nocturnal poem in jp
his element is water, which has been heavily associated with darkness as a metaphor in kingdom hearts
now, let's set aside demyx for a second to discuss the master of masters — and no, this theory isn't one of those theories about them being the same or whatever. i have taste.
the landi lodge on youtube posits that the master of masters may very well be light itself, and i'm inclined to agree; the fact that he says "the truth is what you see with your eyes, not what you hear," only for the screen to flash with light when his name is blanked from being heard is almost evidence enough, but compound that with my outdated theory about him being kingdom hearts itself... i feel it makes sense. what we also know about the master of masters is that he once had friends in a time long ago who fell in another keyblade war, and darkness is his long-time enemy.
there is also a lot of christian imagery going into mom and the foretellers, given the seven deadly sins and whatnot. i promise this is relevant.
one more important detail: one of the thirteen true darknesses is currently unaccounted for.
now, let's get back to demyx and what i think about him:
let's take one possibility for his true name, edym, and consider that it's an alternative spelling of adam. adam was created by god, famously known as a being of light.
let's consider that edym — possibly like luxu, possibly like the foretellers, if you let me be very insane — may very well have been a creation of the master of masters in an era long past. they may be connected in a way without being the same person. consider edym as a prototype replica (which would work narratively given all his talking points and plot involving the replicas), maybe even with, somehow, a piece of the master in him to kickstart his existence — sort of similar to the concept of a nobody. it would explain his light pillar at death, and it would explain his haha, yeah, no dismissal of being a scientist. it would also explain his ancient keyblade legacy. it might even explain why he knows nobodies do have hearts, which no one is aware of canonically.
consider him one of mom's original friends, thought lost in the war. consider him becoming a vessel for the missing darkness and how that would be such a painful insult and personal attack to the master of masters while also explaining his affinity for water, so often linked to darkness. it would also explain the nocturne/nocturnal part of his titles, given that nothing else about demyx really fits that description whereas most of the others at least fit who they're assigned to.
there is also the fact that vexen comments about "men like us, men of science," when speaking to demyx... which is certainly not accurate for vexen's perception of demyx. but consider that vexen/even has displayed a very sharp intuition before in being able to tell that ventus is a heart of pure light, so perhaps he's picking up on something about demyx's past and true nature.
this would all even, in a way similar to how xigbar set off mom-similarity warning bells in others before that reveal, explain what similarities are there between demyx and the master.
i've talked about my theories for luxord and how those would put him around the missing link era, but i don't think mom's original era would be mentioned if it wouldn't also be relevant. demyx having a personal connection to the master of masters would add another layer to the way he's often seen with xigbar, as well.
and all this said, demyx could still very well have ended up quadratum, thus making him a duo with luxord still despite being from different eras.
i hope all of this makes sense. i could definitely spend more time on it to make it more cohesive, but... this is what y'all get.
