All excellent notions.
However I'd perhaps reiterate that the omegas having the "never seen on human players" leftovers would work more for their tempo rather than a "Built for it, like the trolls were" player base like the Deltas.
Who most certainly have a space/time duo among them.
Seer of Doom is of course probably a high odds guess and only shudders down the "Maybe Not" ladder to me given the previous stipulation that the Omegas (My personal take being Tavvy as it happens) have a doom player, and with *ten* players it's rather curious that they don't have the opportunity to hit them all as a collective and in fact have to lack two aspects.
The immediate instinct I'd have there being Heart/Light given Of The Gods would probably be outside Dirk's rather self affected operation style. (Who knows? Maybe they lack space/time and that's why Alt-Callie is out there sitting on the Time Team while she herself is The Space Player Of All Space Players.)
Ly'Lac's connection to flowers and gardening but it only being recent and her being rather...Fractious about it could indicate the very contrived nature of Deltritus rearing it's unsubtle head that This Is The Space Player. Particularly if they're either a destroyer class or something like a page.
Space does deal with alchemy after all. Natural sciences and such.
That and it's rather interesting to suggest a not traditionally masculine presenting character (or at least one that isn't as obvious as Eridan) would draw something like a prince, given the obvious importance the space player has, much less it being Kanaya's Aspect. It's a bit sappy but I confess the idea that Rosebot arranged things however she did to deliver Kanaya's aspect to the nymph that most resembles a curious proper blending of the two feels alot like Rose's Playbook. Bombs are associated with doom yes, but "Count downs" and forthcoming events are also seerly. Seer of Space? If that's the case we've got an interesting potential pattern given Vrissy's acted alot like a Rogue or Thief of Mind with that prison break and all.
Similarly, AA being a heavily indicated seer might point to one of several things depending on their method of augury. Are they an intuitive type? Do they observe some specific arcane method? Are they being spoken to by The First Guardian or indeed, Rose herself? Alot of questions and all are so very fun. What might immediately make one jump to seer could very much be a mage or even a knight depending on the aspect. Heck, given the nymphs in general, according to Ly'lac have a species wide connection to prophesy maybe they're really more of a time player that happens to be carrying water so to speak for The Destined Game.
As it is I'm still admitting the Light/Mind aspect for Vrissy is a bit of a coin flip but I will propose it's interesting that if one were to imagine a fusion of the elements of Light/Space the idea of a physical or logical or quantifiable concept relating to fortune/knowledge/luck would be your immediate result. And really that's intuition, thought and knowledge now isn't it? The Omega kids are marked by their relationship to their parents and to themselves. How they react to that. Vrissy in particular has this Identity Crises of "Well who am I and who do I want to be?" is she Vriska or is she the daughter of Rose and Kanaya? or is she neither because she's Vrissy?
On that specific front I think there's enough speculation to imagine a number of satisfying answers. Not for nothing; Candy Earth C Vriska is actually not named Vriska Serket and is technically not a Serket if we ascribe alot of meaning to her Maryam-Lalonde surnme. Probably enough to break a pattern in Homestuck Logic. And of course, Vrissy's got to have a core character struggle and "Who am I and what do I want to be?" feels like it might be it.
The others are a bit easier...Or less overt. The Boys relate to their difficulty with their parents and Yiffy obviously has the polar opposite of Vrissy's problem. Which of course ties up neatly with the "Red/Blue daughter of Rose, Herald of The Plot".
Regarding TC...Without jumping to conclusions I'm also pretty on board with Time for them. Making CHA.OS does vibe with that, especially since he sent it to Ly'lac, who has The Garden Thing going on. A clockwork lily is a fairly potent sign. He's also pretty chill which seems to remind some of Gamzee and others of Dave. Possibly intentionally.
Unrelated to classpects (possibly) but the fact we saw Terezi's quirk in the prompts for GC tag using Ly'lac does bring up the question of if it's The First Guardian playing Exile for the players or it's something of a grace note for her tag-sake. I suppose that one is easily proven out of whoever is next (I imagine TC but it's impossible to tell.) having Terezi's or their Tag-sake's appear.