I think It would be huge and awesome fun
But I dont know post in your Ideas about it describe it good colours does it have horns or armor and stuff?
Id like one like whale shark but more dark and 5 seats to sit on and a spike inside it's tail That would be awesome
Maybe an boat like inside thousand needles useable only for guild reward so guildies can hop in and u can ride with it
what about a Bird?(I mean proper one) maybe a LW mount you need to collect leathers and feathers and then you can craft it (not too expensive) price should be around 3-6k so even poor people could buy one without getting into big money problems
what about a Serpent for ground mount or a spider??
what about a A boar with cool armors or a cooking mount like a jelly what would move by hopping and it could be 2 seater
But anyways post in your ideas and I will be looking at them
also I'd like crocodile mounts awesome dont you??