Rhiannon Yaxley

She's the girl that never sticks to her promises.
She looks out for herself and works on instinct.
Rhi is from a long line of proud purebloods and takes pride in that. She is currently a Death Eater after befriending Crouch Jr and being branded with her boyfriend Jay Hawkeye.
She's temperamental and flirtatious. She finds humour in other peoples misfortune and deems herself the prettiest girl in the school. Which she basically is. She is very unaccustomed to the concept of jealousy as she's never had cause to feel it. Girls envy her and boys yearn for her.
She has long caramel hair and brown eyes, her skin is an olive tone.
Rhiannon's patronus is a lynx.

Rhiannon: Pretty much like this:

He's tall with strong arms and chest. Blue eyes and light blonde hair.
Chaser on the Slytherin Quidditch team aspiring to be captain and kick off the beaters who he thinks are, to be blunt, shit.

He's a sixth year Slytherin boy with a passion for Quidditch, drinking and girls. He's an average student. Luke is Rhiannon's cousin but they aren't that close. Acquaintances you could say. He aspires to be a Death Eater as soon as he leaves Hogwarts. He's an average student.