Kelpies are also a good idea. We can also remember Hippocampi, since we really need a water elemental. And yes, if I were to add another horse, I would rather replace the Kirin, although a classic unicorn is definitely needed there. There's a temptation to create a city of horses 2.0, but we'll manage with just one horse, as long as it's not as terrible as it is now.
And instead of axolotls, I would approach it from a different angle and offer something fairy-like, such as will-o'-the-wisps, dryads, spriggans, pixies, and actually anything, any of those nature spirits that you can find in any respectable mythology. Even something like the auras from the sixth game. Again, typical fairies haven't been added, so we can go wild and bring back old acquaintances.
And to top it all off, replace these damned Iriad with normal Ents, and the drunken bumblebees with some mini-dragons... Or have they already been sent to the neutrals? I don't remember. Well, never mind, it's very difficult to make the current lineup any worse.
🏹🎪+⛓️♿=💕