>>13896222If we're gonna talk about these pokemons' personalities solely based on looks and types (since that's the only information we have), I think you've got this backwards.
Tyrunt would be the spoiled rotten kid picked for everything. One, EVERYONE seems to love him no matter what. He can do no wrong in most people's eyes. Two, he's been called a "King" multiple times, so he's going to be treated like royalty. Three, he's a fucking Dragon-type, which is the only real reason people like him. He has tons of resistances and is generally considered a strong typing.
Amaura would be the underdog who gets bullied all the time. One, nearly everyone seems to hate him just for being cute. Two, it's not a fucking T-Rex, the most iconic dinosaur in existence. Three, IT'S PART ICE. How the fuck does Amaura have "everything given to it"? Amaura would be kicked around all the fucking time.
Then, let's look at the "grown-up" versions. The T-Rex evolves into a "bad-ass", good for him. Shame that he'll be getting the death sentence with that insane temper of his. Don't think that neckbeard's spiky bits are gonna help him in the electric chair.
Then, we have Aurorus, who will have learned from the hardships of being hated all it's life and accept the fact that it's a weak type. It will learn to be strong despite that, and use it to it's advantage, even being able to do something no other ice types have been able to do before; be super-effective to water types. It would become a successful, beautiful adult, where the big bad T-Rex is in jail for the rest of it's life.