It's funny, but i've always felt like Evanna really is one uf us. She was such a huge fan, probably like a lot of people here, and then she was chosen to play Luna. She wasn't just a random girl who wanted to play that part, she really knew and still knows her character very well. I can easily imagine her posting comments on Harry Potter news and everything we do right now!
From the first moment in OotP i saw Luna in her. That part was destined to be hers.