Who are the people we don't have names for yet in the 6.2 artwork?

[RyuDragnier]

With Ericthonios mentioning that he was overwhelmed by a cacophony of whispers before he went crazy and attacked us, I'm leaning into the whole "resurrection gone horribly wrong" angle with Lahabrea making a failed attempt at bringing back Athena and perhaps getting a whole mess of souls from the Lifestream or elsewhere tangled together in the process.

That could also perhaps serve as the origin of the research would eventually lead to Zodiark's creation with him realizing the potential of souls uniting.

And perhaps it is the "cry from deep within the earth" that ended up causing the Final Days originally. Giving us the original catalyst (remember, Meteion was not on Etheirys, she needed something to be the original transformation to cause the chain reaction), what inspired Zodiark, and may end up explaining why Themis felt like only he could be the central soul that could keep Zodiark in check.

[Cleretic]

Giving us the original catalyst (remember, Meteion was not on Etheirys, she needed something to be the original transformation to cause the chain reaction)

...no? All indication is that Meteion's 'song of the end' was literally her directing corrupted dynamis towards the planet; the 'sound from the earth' was either an early sign of things breaking that was misinterpreted as the cause, or Meteion's actual song that the Ancients misattributed direction to because they're not really used to Space Sounds.

Not only does she not need an 'original catalyst', she wouldn't have had a chance to instate one since her first action after the mental breakdown was leaving the planet. Not to mention, since the End of Days hit in the exact same way in our time after Fantastic Dan broke Zodiark, the story of Pandaemonium can't possibly be 'we break the thing that caused the first End of Days'.

I like the idea of us finding sort of a proto-Zodiark down there, but I don't think it needs to be a secret second gunman for the End of Days, that's just needlessly complicated.