Heck yes on the hippocamp and the kelpie, love the ideas, and already (tentatively) had them on the list. If people actually want them, that makes me think they actually deserve to be added. Also considered the hippogriff, but it doesn't add a whole lot to what a pegasus can already do.
Another person suggested adding thestrals, from the Harry Potter universe, and I'm considering those, as well.
Thanks for the feedback! I've enjoyed making the mod, and I think you'll enjoy playing with it!
No problem! I'll definitely enjoy this mod.