Bunny people.
They would have filled the role of 'savage warriors' in ALO and now live in small tribes in seclusion.
But as mentioned by Sakuya previously, we probably wont see much of them in all likeliness, they hide in the deep forests and are largely nocturnal, and really, everyone has enough problems on their plates worrying about the war. Same goes for the Nyriad/Mermpeople who mostly chill and do their own thing along rivers, lakes, and waterways. Now, you might be able to get close to a Mermaid/man while (s)he's sunning him/herself, but they're sort of like cats (i.e. you don't matter to them,
at all) and like the Seraphi, they don't show any real ability or desire to communicate using a discernible language though they are intelligent tool users that must have some method of communication.
I figure the Spirits at Ragdorian lake took one look at them, noted that all they did was sleep on the shore and eat fish, and decided they weren't bad neighbors and went on. The Dwarves crawling around in the deep mines and of course, the Jotuns might be a bigger problem. But hey, maybe they'll mine Northward and become Germania's problem in a few generations.
Edit: A little more back story.
Coinin Sidhe still possess the use of their wings for flight and can use some simple magic. They would have been a humanoid race in the regions of the Puca and Cait Syth.
Nyriads were basically ALfheim Mermaids and more common around the Undine territory as well as area of Spriggan and Imp territory. They're main adaptation is a powerful tail and wings that have adapted to act as a propulsion method underwater.
Dark Dwarves are vicious little Cannibals (in the sense that they are related to 'Fae' and like to eat them) that live in the middle levels of the underground Corridors and infest the deeper galleries of the Gnome mines. They possess only earth magic but are expert crafters. They're quite capable of crafting Dark Amaglam weapons and can make products nearly as good as the Leprechauns, that is, if you can convince them not to use said products to kill and eat you.