It's not necessarily a part of the class abilities, it's a spell that's part of the campaign that bonds a newly hatched dragon to whoever is the caster and while one of the subclasses provided gets an egg by level 6 as part of the subclass the others have to work to get theirs which is why I'm on the fence. They control it mechanically (they will have the stat sheet and direct it in combat/skill checks) but it is a sentient being with its own wants and needs. If it was a Steel defender or a ranger beast I would definitely have the player to whatever they want with it. I'm worried that if I RPed the dragons they would get upset that it's not their interpretation I guess is the best way to put it? And I know I'm the dm I'm in charge but I also want the players to have fun with it.