Okay then, but I forgot some...
Enkidukai
Can they sheathe and unshethe their claws?
Do they have a Jacobson's gland (that cats "taste" or smell the air better with), or a similar organ?
Can their pupils go from slits to circles, and do their irises go to almost the visible corners of their eyes?
Do baby Enkidukai crawl, or walk on all fours?
Nolthrir
Can they talk to each other underwater?
What color is their blood?
Kran
If they somehow get hurt, do they bleed?
Do they have bones (maybe made of rock) and muscles?
Are their eyes gemstones, a different kind of rock, or something else?
Can they smell?
Can they feel? If so, how does that sense work with skin made of rock?
When a kran is born in gemmation, does kra grow to kras full size quickly, or are younger kran smaller than older ones?