She's in Slytherin year three and she considers herself a pureblood even though she has 1/4 Veela in her. Because of that Veela blood she has a certain charm over the opposite sex but because she's not even half Veela, it's not exactly the same. They way it works is if she really wants a guys attention she gives off (want seems like) an extra dose of pheromones. It doesn't always work, because the guy doesn't always respond but because it's not a direct dose, any guy within a 5 feet radius is hit by the dose as well.
She's the daughter of Fleur and Bill Weasley, they live next door to the Burrow because Bill wanted to be close to his family after the war. Fleur's parents don't like who she married but they love their grandchildren so they're around somewhat. The Weasley/Potter clan seems to be close (i don't know if it will be developed to be very close or if people will make it normal or what) but Moll is somewhat isolated because of her sorting into Slytherin as opposed to Gryffindor like the rest of her family.
She doesn't quite fit in with Slytherin completely because of her halfbreed blood, but they accept her a lot more than they accept muggleborns and halfbloods, and because she's technically a pure blood people seem to like her just fine.
She's considered very pretty and does have a SMALL fan club of admirers. This is a group of TWO boys who basically want to do everything for her. She doesn't take advantage of them though and rarely realizes they're around. I'll probably only mention them if I'm bored and have no reason to update but want to.
She's very friendly, even to muggleborns even though she's starting to develop a slightly purist attitude. She's not a complete Purist because she doesn't hate muggles and muggleborns. She just thinks they're beneath her regardless of her halfbreed status.
So add her to your friends list. She has two blogs that are already up and ready for comments!