Cedrica can somewhat ping-pong back and forth between angelic sweetheart and sharp-tongued bitch - it really depends who she's accompanied by. Most of the time, though, she is a well-mannered girl with a taste for recklessness and a love of living in the moment; if the events of her family life have taught her anything, it's that life can end at any unexpected moment, so there's no point in wasting it. There's a lack of filter between her mouth and her brain, so often phrases come out which should really have been kept behind her teeth, but hey, some people need to hear brutal honesty. She has no problems making her opinions heard, and is fiercely independent - sometimes this can overbalance into plain rudeness, but if she realises it, she'll apologise... if they deserve it.
Her mother brought Cedrica up to be careful, so careful she is. She won't do anything unless she's completely one hundred percent comfortable with it, and she'll always make sure she is safe before doing anything reckless. There's nothing wrong with putting yourself first if it isn't in a malicious way, right? If there's enough time for her to jump in front of a bullet, there's enough time for someone to jump out the way.
She's clever. Damn, she's clever - much cleverer than she thinks she is. What else could have swayed the Sorting Hat from Slytherin to Ravenclaw?
She's totally of the lads; as much as she enjoys drama, girls get themselves into it way too easily. Like boys, she'd rather fight something out and resolve it quickly rather than be ridiculously conniving and vicious like girls are. Getting along with lads also gives her the chance to be a flirtatious little thing, and that's always an upside. However, her dislike for girls stems from many things - how dramatic they are, how backstabbing they are, how vicious they are - but mostly, it's pure jealousy. Cedrica has always been second best to a girl. Whenever she likes a guy, his heart has already been captured by someone who's smarter, prettier, better. Honestly, she's damn sick of it.
Rebellious at heart, she doesn't have a total disregard for the rules - she's just allergic to strictness, especially if it's unnecessary. She hates Hogwarts uniforms (um, hello, she does have an identity) and always sneaks out at night to just go exploring because honestly, what's the worst they can do? Expel her? Oh well, there's always other schools.
Potions are the reason Cedrica was ever put onto this Earth - to carry on her mother's legacy as one of the best potioneers of the modern age. She'll always be brewing some sort of concoction, and if the naive first years refuse to fall for her charms and test out the potion, she'll often end up spiking people's drinks with the mixtures to see the results. She doesn't make poisons, though, so don't worry - she isn't that alike to her mum.