So these are small things I've picked up on the various creatures that's not really mentioned anywhere. Maybe they're bugs or oversights or maybe they're deliberate design choices. Now onto the various things I've learned.

Some dragons can fly backwards and sideways, an amazing trait to have in my opinion given the maneuverability it gives you.

Confirmed dragons that can fly backward: Zetsumetsudoragon, Dread wyvern, Bronze wyvern, Bahamut(very slowly), Mira, Legendary storm drake, Tiodrio, Dark smokebreath

Confirmed dragons that can't fly backwards: Scaulding wyvern, Dracon, Kampe, Fatalos, Alarion, Ymir, Hellkite Kin, Banshee, Jabberwock, Vampere

Confirmed dragons that can't fly sideways(if a dragon isn't listed here but is listed above, it can fly sideways): Bronze wyvern, Dracon, Hellraiser, Kampe, Fatalos, Alarion, Ymir, Bahamut, Hellkite kin, Banshee, Mira, Legendary Storm Drake, Jabberwock, Vampere, Dark smokebreath


Will edit this with more info as I play around with the mod.