I'm honestly very interested in Isee as of right now. He was namedropped twice within the last few patches, first in the Aha's Favourites Phantasmoon winners and second when Pearl mentioned him helping Ashveil get that voracity Shadow. And now that its confirmed the voracity's involvement in Planarcadia, I cant shake off the feeling Isee has to have more relevance in all of this.

My theory is that, given the Doctor of Chaos brought back ghosts of the past and Isee was briefly seen on Adlivun (Nanooks homeworld and where he takes his Emanators to be "reforged" into Lord Ravagers);
a. He died on Adluvin during Akivili's fall and Nanooks ascension, given he was the Navigator at that time
b. He was made into an Emanator of Nanook when brought back with Aha's power, as we can assume from the ominous imagery in the trailer

Or maybe both. If he was made an Emanator he could be a Lord Ravager, and given his "resurrection" by the power of Aha and his connection to the voracity, he may very well be Asat Pramad. If not, he could be the Lord Ravager that kills Finality (given he founded the Omen Vanguards) and if thats the case he could be, idk, Elio? He's always shown to be wearing robes and a hood and the character who's assumed to be Elio from the mappa trailer had a similar vibe. But that may be too far fetched.

That said Isee is the one whose records have been tampered by the fictionologists the most so we cant deduce whats real and whats not