Courtney Nevermind

Backstory

The moment the sorting hat fell on her head it rang out Slytherin loud and clear. As she lifted her hands to pus the nasty old hat off of her head it whispered to her in a serious tone "I would make a snide comment about your personality if I thought it made you a difference". Courtney stopped and let a slight grin spread over her face. "You're funny, but I hope you get filled with lice" she whispered back before finally taking it off. She reached it over to hand the hat back to the professor, but before the professor was able to take hold of it, Courtney let go and let it fall heavily to the floor. She looked down on it, feigning a surprised expression "Oh man I'm such a clutz, I'm sorry!" For anyone that might've paid close attention they would've for a split second seen both the intention and humor she beamed of as she left to join the others.

Courtney is a manipulative smoothtalker with a lack of empathy and skewed morals. While she has a very limited range of emotions she is a good actress when it comes to feigning appropriate responses to different scenarios.
The downside of having little emotion however is the looming, near constant state of boredom it puts you in. This often steers her towards reckless actions and irresponsible decision making. Breaking the rules, or even the law, is nothing she is deterred by in the slightest.
She does whatever she needs to get what she wants and to meet whatever goals she's set her mind to. Most of the time however she just does or says whatever she thinks will be the most entertaining. Getting reactions out of people and stirring up trouble is a favorite pastime.

While big eyes would typically make you appear warm or sweet, something about Courtney's eyes is almost empty or predatory when fixed on something. A perceptive person would not have a hard time noticing that something about her gaze is lacking and calculating in nature.