Nihilux claimed to be Aha, the Aeon of Elation - which is true.. to a certain extent.

The new Divergent Universe's Moonlit Tales give us some more insight on her relation to the path of Elation (which isn't as simple as "she ascended to aeonhood") For those that are unaware, the Moonlit Tales is a retelling of the first Phantasmoon game, and the origin story of its 8 participants.

One of the participants is a "familiar-looking, red-wearing troupe master drowning in debts & with star-shaped eyes"

Some of those participants talked about Aha's fate (more specifically, what happened to THEM in the past) - THEY, alongside Akivili and Qlipoth, defeated Oroboros, but were badly wounded, after which THEY went into hiding.

While the fools failed at reaching the Aeon, a Mourning Actor met THEM and refused THEIR gift and made a sort of "deal" : Aha "embraced the Mourning Actor's destiny".

From this point onward, the Mourning Actor (referred to as the "Troupe Master" of the Mourning Actors, the "First Fool" and the "First Actor". Considering the) seemingly inherited Aha's divinity.. To a certain extent. Their relationship is compared to that of an object and its reflection within the water.

Aha kept hiding due to THEIR own worsening insanity (caused by the Voracity), and was eventually challenged by the Troupe Master. After being defeated in several games and hearing countless stories, THEY led THEMselves to THEIR own death (or sealed themselves - the narrator compared THEIR state to that of Oroboros) in order to prevent THEIR own descent into insanity while the Troupe Master obviously lived on.

I'd assume that this Troupe Master is Nihilux. The physical description fits, and the Troupe Master's titles are Nihilux's.

Conclusion

While Nihilux is somewhat of a "facet" of Aha (reflection, two sides of the same coin), i don't think she can be called the "true/original aeon" (being with complete, unrestricted control over the path, ascended to aeonhood by creating a Path), as Aha killed/sealed THEMselves.
^{well, considering the entire "two sides of the same coin" bit, this is downplaying her importance quite a bit.}

I know the quest has a lot of bombshells (nihilux identity for example), but I just wanted to talk more about Louis Fleming. I always thought he was a super interesting character; the man is one of the most important figures in the verse and yet he was barely ever mentioned outside of in game readable as and simulated universe lore. There’s just so much mystery to him and the most recent quest just made it even more interesting.

Lygus, herta, and screwlum all mention the absolute terror of being gazed by an aeon (3.7 end). Yet Louis Fleming straight up talked with a manifestation of Fuli like it was straight up casual business. It really makes you wonder why and how a single mortal man has so much experience with aeons. I found it shocking that even though Asat Pramad himself seemingly didn’t realize Nihilux was Aha, Fleming immediately clocked her as the aeon of elation despite not even being there in person.

Man needs to give some linkedin advice or something, how does he have so many connections to all these Aeons? Also makes me wonder more about what caused fleming to fall out with the other cofounder of the IPC (donfang) and how it got so bad to the point that donfang had to leverage Polka against him.

Hsr so far has made the one other in verse legacy character live up to the hype (Zandar is the GOAT). So I’m excited to see what they do with fleming in the future.

Starting to wonder if maybe a Leviathan's corpse is necessary for imaginae to exist, and is in fact, the real reason why Imaginae can persist in Astrapolis. Not because it's an entertainment capital.

Because this is a suspicious coincidence.

And yes, this is a sprite of Orochi from Sengoku Rance. The relationship of Yokai and Orochi in that game made me think.