I've written a few guides on my old side blog on whether you can eat various Pokemon, Neopets etcetera under Kosher law. Here's my thoughts on which Santae pets would be kosher to eat under Jewish law and a few interesting edge cases:
Raylen -- a bit of a weird one. In terms of birds, Raylen really resembles a small parrot, and parrots are typically not kosher. However, parrots typically have a toe alignment of two in the front and two in the back, which is one of the identifying features that makes them definitively non-kosher in certain rabbinic discussions. Meanwhile, the Raylen has three toes in the front and one in the back, an alignment much more associated with kosher birds like chickens. Assuming there is some tradition of eating Raylen, I'm comfortable saying they're probably kosher, even though I can't confirm they have a peelable gizzard.
Yelbin -- this looks to be a straightforward example of a kosher mammal to me. The criteria for a kosher mammal are that it chews cud and has a fully split hoof. Again, I can't confirm Yelbin DEFINITELY chews cud but it's clearly a deer analogue so it's a pretty safe bet.
Kyree -- likely kosher, but I'm not certain. This is a less clear example, as it has very horsey vibes and horses are not kosher in real life. Horses can't reverse their digestive system in order to chew cud and, of course, their hooves are totally solid. Kyree have cloven hooves -- except for the Netherflame Kyree for some reason. Solid hooves on that thang. Why?
Pheros -- likely kosher, but problematic. Again, there's a good toe alignment here, and this is Bird to me. It may be difficult to prove a tradition of eating Pheros, as they have only recently been resurrected from fossils, but I guess maybe there's a really, really far back tradition. I am not willing to rule either way on their gizzards. There may be an issue here if they are predatory, since predatory birds tend to be excluded from kosher-ness.
Luffin -- likely not kosher, but the reasons are complicated. Search things like "are penguins kosher" on your preferred search engine if you want to understand that.
Aerios, Zephera -- likely both not kosher, for the same reasons that the bat is included on the list of "non-kosher birds."
Xyren -- double not-kosher because it has a non-kosher toe alignment on the front and solid hooves on the back. I am very impressed. I wish there was some way to also argue this is a non-kosher fish for the hat trick. Is there any evidence of Xyren swimming?
Kirgem -- those back hooves look good but I'm just not convinced on this one. It's some sort of kittypuppydragon and I'm not comfortable saying kitties, puppies or dragons are kosher.
Aesiri -- disturbingly, might be kosher if it has the right gizzard and diet. It has feathers. It's a bird. Does anyone know what these things eat?
(non-anon, thanks for humoring me in these trying times of nothing particularly happening on Santae)
postung because its funny but introducing a new tag - notsalt, for all those who want to only see salty posts
