Leroy's goal is to achieve the fifth mortal coil, but he doesn't think he can achieve it. However, he believes that Arthur is more than capable of reaching the fifth mortal coil. This is why he was jealous of Arthur.
He doesn't hate Arthur at all. He doesn't even have feelings of dislike for Arthur.
He has no reason to hate Arthur. He is just jealous of Arthur's potential, and no matter what Princess says to cheer him up, he won't be cheered up because Arthur isn't the source of his jealousy.
He didn't dare tell her the source of his problem and the reason he is lacking self-confidence. because he doesn't think she can say anything helpful.
From what he has heard from her, her family will definitely hate him and look down on him. As a family of beast hybrids, they look down on every human.
It can be said that they are racist and it can be certainly said that he won't be an exception to their racist opinions towards humans. So they are beast supremacists.
