If this eventually leads to a mount reward, I'm sure they'll both be flying mounts. In this storyline only one of them did but there's plenty of room to expand at a later time.As for the model design, I'd like something similar to what the Imperial Quilen and Mystic Runesaber have. Mechanical add-ons that summon a set of anima-powered wings similarly styled to the phalynx's energized tail.Or they could just fly 'as is'. There are plenty of mounts that fly without actual wings. Remember the Jewelcrafting's flying cats? The Monk's Legion class tiger, the Paladin's Legion class chargers. The Headless Horseman's ...horse. And many others.
Will you be able to continue with this questline if you've not chosen Kyrian as your covenant?
Both mounts have vendor (rep) mount versions that can be purchased. If your concerned you may not get one of each model, both are available from Bastion vendors for purchase when you reach the correct reputation. If you just a "gotta have em all" type then yea, you'll need a second character. If you just want a model from each then choose whichever you like the most from the quest and you can pick up a variation of the other later from the vendors.
I played with a Dk also, and had the same order as you.. I just assumed that was the natural order.
So i chose Larion on the quest and now I cannot see any phalynx's in my mount tab even though I had two as rewards/drops. Do you think this quest may be related?