Harry Potter and the Half-Blood Prince
House: Gryffindor, 6th Year
Lavender is Ron's first girlfriend, and she has a knack for coming up with the most awesome nicknames for him. Our favorite is "Won-Won" (think baby talk). She and Ron get very cozy in Book 6, but eventually Ron grows a little tired of her shrieky, giggly, possessive ways. After trying to find a way out of this relationship, Lavender eventually breaks up with him when she sees him spending time with Hermione.