More organic world building is always fun. Confirmation on the orbs and their use as waterproof computers helps and I believe this is the first "Sigil" yet displayed. None of the Omegas have them (Yet at least) and ly'lac has her curious around the eye marks, and The Caretaker of course has that curious circle that may or may not be the nymph version of the swiss medical cross?

Lots to consider.

Personally, between the text colour, the very interesting handle allusions and the ungulate/mammalian ears the silhouette is probably CC, to join the ranks of Ominous Silhouettes with AA and her big wizard squid head. It's of course possible those are fin like projections as occur on certain octopi and cuttlefish, or , given that CC loves anime, possibly cosplay.

Or horse ear headphones. "Cloistered" very well could be her expressing a shut in or rarefied lifestyle that isn't embraced by many given her interests.

Cow & Chicken also had some interesting episodes it must be said.

While I'm Certainly not suggesting we rush anything, I do think that rounds out alot of the basal world building we'll probably need. But who is to know? The programming language's name and no less than the third and fourth curious ancient character from Deltritus' impressively swift past is another curious element though. Characters inserted by Dirk and/or Rosebot during various detours in the fast forward? Archetypes engineered for utility by any of the same plus Terezi and her automatic inclusions and suggestions? Given we can pretty much imagine The Voice works like an exile terminal, under her control, that lets her have some rather direct leanings on the deltritans.

Hard to tell either way at this point but it's really very fun expecting more!