It all started from this cp-
Robin is touching a skull, and I think Oda could do the same thing he did with Ace. The fact that she could die soon. I hope it doesn't happen beacuse I REALLY like so much Nico Robin, but from the end of this saga she's more and more in danger because she will be search by the WG
Why that? The power up of Luffy in the same cp is the demostration that this cp is obviously telling us something about what will happen in the future. I believe that Zoro' s eye and Sanji t-shirt means something, but it's not today thread...
You say who could read the poignee grif other than she?
The answer is one: Pudding
Big mom hinted many times that she needed Pudding to awaken his third eye, and even with a dialogue with Kaido is said (I don't remember the chapter) that if she awokened it she could read them
She fits also the strawhat patterns, and she could really join the crew in my opinion
1- She is from a non-human race (three eyes tribe)
2- she could be archeologist as Robin, but who knows... also a spy because her capacity to change memories and influence people
3- She fits the letter pattern OP
4- She has a character that could fit well with the other strawhats beacuse of her bipolar disorder
5-
Her color would be Red-Orange
Yellow- usopp
Yellow green- Carrot
Green- Zoro
Blue- Green - Franky
Blue- Sanji
Blue Violet-Yamato
Violet - Robin (ec)
Red-Violet (chopper)
Red- Luffy
Red- Orange: Pudding
Orange- Nami
Yellow-Orange- Jimbei
White and black - Brook
Anyway, there is also the possibility her to join without Robin's dying and maybe she could have some other roles in the crew, it's also a realistic option.
But IMO she would fit perfectly and maybe after Wano, with BM pirates collapse after Big mom defeat, she could go joining Luffy crew...