Who is Luna Lovegood in Harry Potter and the Half-Blood Prince?

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She is awsome!! She meets up with them in Order of the Pheonix, she is very strange, quirky and Unique. But definately a little bit weird. a bottle cap neckalace and radish earrings are some of her infamous items. Also reading magazines upside down, and talking about strange creatures. Not a lot of the girls at school like her. They call her loony lovegood since she's a bit strange, and hide her things. But she doesn't care what so ever. She knows who she is. Her mother died, so she can also see Thestrals like Harry. She's blonde, very cute. Like I said, unique. she's in Ravenclaw I believe. But she's definately awsome! Shes a favourite to many!