Scarlett played Pansy Parkinson and mean witch in Slytherin who is romantically linked to Draco Malfoy. In the book and film she often tormented Harry Potter and his friends.
A video about the marauders :)
Steven Strait - James Potter
Taylor Kitsch - Sirius Black
Chace Crawford - Remus Lupin
Toby Hemmingway - Peter Pettigrew
Laura Ramsey - Lily Evans