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

[Lyth]

Someone else pointed out that if Lahabrea is split between two beings, it would match Mateus from FF2, the original Pandaemoniums master. Might also explain why we seem to have conflicting character traits attributed to Lahabrea.

In FFXII's lore, Lahabrea, the Abyssal Celebrant is the counterpart to Mateus, the Corrupt, and both are associated with the Pisces constellation (which is also on the corresponding Convocation stone in FFXIV). Lahabrea's Ascian glyph is derived from Mateus' glyph from FFXII. In fact, you can do this for all of the glyphs we've encountered so far, as has been observed by several people.

Here's the Clan Centurio Primer on Mateus from FFXII:

“Scion of darkness ruling and protecting those who live in the underworld, in opposition to Lahabrea, Abyssal Celebrant and scion of light.

In the course of his rule, he submitted to avarice, and the darkness took his heart, transforming him until he was both evil and corrupt. Then in his cowardice did he bind a Goddess of the Demesne of Ice, and using her as a living shield, he challenged the gods.

Defeated before their might, he fell screaming into the depths of hell, there to be imprisoned for eternity.”

Whether they'll ever actually draw a link between the two sets of figures remains to be seen, but they keep teasing it with these off-hand references. Although I suspect that they'll remain unrelated, and the Lucavi will end up being referenced to the Void in some capacity if we ever end up in Corvos and its neighboring territories proper.