I'll have a post up soon. Still figuring out how Amethyst will be around the other students. I'm deciding between a mixture of Chanel Oberlin and Regina George OR having her having a hard time trying to be a good person just to spite her mother.
I think the Regina/Chanel type can be fun in the short-term but it often doesn't work out in a roleplay. It can be difficult to make relationships with a typeset like this; in the movies and TV, the character is often 'supreme' through prolonged self-assertion. In a situation like this, she'd be around new people who are much less likely to take her bullshit. And people that fit in that mould rely on having minions (or Chanels), so it would be important for them to actually make friends.
Plus, I think that kind of character would be quite predictable for Amethyst.
But the idea of her struggling to find her moral alignment ("I'm bad luck; good was never an option for me") has a lot more potential in an interactive setting and would give her a much broader scope for character development as opposed to her just being the Sassy Supreme.
Just my two cents, because you know I love you. Whatever personality you decide to give her, I'm sure Freddie would respond well to her.