Hi! I just had a brain hit like 30 seconds ago and this full new theory is in my head! It's not actually a theory, just something I noticed, and the last part is kind of a theory.
So. We know that Teirgan=Granite. I've known for a while that it's an anagram (I'm sure everyone knows what that is, but in case you don't, it's a word that has it's letters rearranged to make another word. So in this case, Teirgan holds all the same letters as Granite.)
But then I only just realized (You all probably think I'm stupid) that Forkle is an anagram of Kerlof, as in Magnate Leto Kerlof. It appears that the Black Swan really likes anagrams! So...what if someone else's name in the collective is an anagram? I was considering Astin, but the only name already introduced to the series is STINA. So...wild guess here, but I'm pretttttty sure Sir Astin is NOT Stina. (Sarcasm, btw) And even if Mr. Forkle could disguise himself as Stina in some way, they've been together in a scene. And it was after one of the Forkles died, so it couldn't have been him and his twin.
Before you wonder if/why I'm actually considering this possibility that Sir Astin is Stina, I'm not. Just putting all the evidence out there, I don't actually think they're the same person.
Anyway, we know:
Squall=Juline
Granite=Teirgan
Forkle=Leto Kerlof, Sir Astin
Blur=? (Theory he's Jensi's brother)
Wraith=?
So, can anyone think of any anagrams for those names? 'Cause I can't. At least nothing that makes sense.
Thanks for reading, I hope you liked this theory, but you probably already knew all of this.

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Keeper of the Lost Cities Theories!
FanfictionJust a ton of theories I have about the following books and some characters. Please add if you have ideas! Comment!