From what we can tell of Rakan and Xayah's dialogue, at least Rengar is being rewritten as one (unless Rakan is just trolling), and probably Ahri will at least have some connection to them, but who else should be reclassified as one (or at least end up connected to them) in terms of lore?
My bets on:
, 
and 
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as a vastayan that shapeshifts.
as an acsended vastayan/ Vastayan goddess.
as a vastayan monkey (not necessarily the one we saw in the journal) that came in contact with a rune stone.
Also Urf...
?
Beside Xayah and Rakan we have some other vastayan already.
Ahri is 100% confirmed as vastayan, as she was described in the vastaya-field-journal
Rengar is surely a vastayan, we can say that from the artwork in the vastayan page, there's a guy that looks like Rengar and we can probably assume he is one of the same species as Rengar.
Nidalee is a vastayan, or at least she has diluted vastayan blood since she is a shapeshifter as the human-pig guy in the vastaya-field-journal.
Swain is probably the same as Nidalee.
Wukong is tricky, he could be a vastayan since he was born from magic, but he's not really a union between a human and a chimera. I like to think he's vastayan since he was born from a runic stone touched by another monkey.
Zyra is probably a vastayan, her lore is very similar to Ahri's, so if Ahri's lore doesn't get changed, Zyra has a good chance of being a vastayan.
Then we got Alistar, Nami, Fizz and Volibear, although we know that they're from some kind of animal-human tribe, we don't know the origins of their tribe. So they could be but we aren't sure yet.
I don't know anything about Udyr in this piece of lore but I don't think he's a vastayan, probably he's correlated tho.
For those who are thinking about:
Tham Kench: he's a demon and probably he's not correlated to the vastayan.
Elise: she's basically spiderman and probably is not a vastayan.
Shyvana: she was born out of a rape basically, she's not a magical being and unless they change her lore she's not a vastayan.
Soraka: she's a celestial, but she could be a vastayan.
Ivern: I bet you didn't see this coming, but he probably is vastayan, he was born from the magical union between himself and the God tree, also this union happened in the forest in the north of Ionia, so he can actually be one of the vastayan creature.
Hecarim: he's a demon from the shadow isle now, he's not vastayan.
Rammus: he's not vastayan, he can just talk.
Skarner: same as Rammus.
Twitch: I don't know if they changed the lore but he's not a vastayan since he was born as a byproduct of an experiment in Zaun.
Cassiopeia: she's not vastayan, she was turned into a snake by a Shuriman poison.
Anivia: she's not vastayan as she is a legendary freljordian entity.
This is what I know based of a combination of old and new lore.
Someone being a Vastayan is like a dog and a cat being a mammal. They're two different species, but fall under the same classification. So Volibear for example, would still be an Ursine, but he could also be a Vastayan.
Udyr and Swain appear to have things going on. Ahri definitely is, although appears to be an outcast of sorts from Vastayan culture.
Does Elise get her power from Vilemaw? I don't imagine she'll be Vastayan.
Nidalee might be, a lá the pig in the story. Rengar and Wukong I imagine will.
Cassiopeia won't - her lore already lists the reasons for her snakelike traits.
Soraka's goatiness is part of her identity as a celestial being, I guess. I don't imagine she'll become Vastayan.
I briefly wondered if the Fae have any connections to the Vestaya or if their magic is just similar because they can polymorph people, but then again Cassiopeia was cursed, too, and the Ascended have animal traits so I assume a lot of magic types can do that.
To people who say Wukong isn't a Vastayan, keep in mind that his lore is pretty old. I don't think Riot is attached to him being transformed from a rock.
hey! isn't anyone going to talk about the most important character in the whole lore???
summoner's rift's top side shopkeeper is a vastayan!
