The extended zodiac bugs me, because it’s 288 signs including Karkat’s. But Karkat’s was never a real sign, it was the Signless’ shackles. So they’re one short for limebloods.
The Signless didn’t exist on Beforus, though, and Kankri’s still 6-ing and 9-ing letters. I’m not sure if this implies that he has the same sign as Karkat, but it’s a possibility it existed beforehand.
Oh, hmm.
The fact that Aranea wears it as a nod to her picking up the Signless teachings makes me think it’s not Kankri’s? But then Kankri’s quirk is way more based on it than Karkat’s is, so I don’t even know.
It would seem a little weird for trolls to adopt as a religious sign something that also belongs to one 288th of the population?
I think it’s also fairly likely that the extended zodiac, while a more extensive list than we’ve ever seen in the past, is still not an exhaustive list of Alternian bloodline icons (let alone panuniversal). I have a hard time believing that even Vriska would be this obnoxious about her grand ancestral destiny if one out of every 24 trolls her color share her exact sign. And the lower castes are much more populous – I think it’s likely we’re missing dozens or hundreds of lime signs.
(I mean, for that matter, there’s no guarantee that this is even a complete list of Aspects – if we decide to take Hussie’s comments about the the squiddle session that created the troll universes seriously, and we assume Aspects do not repeat within sessions, then we’ve been shown, at most, a quarter of potential Aspects.)