Jennifer

“Hello, Harry!” she said.
“Er — my name’s Barny,” said Harry, flummoxed.
“Oh, have you changed that too?” she asked brightly.
“How did you know — ?”
“Oh, just your expression,” she said.
Like her father, Luna was wearing bright yellow robes, which she had accessorized with a large sunflower in her hair. Once you got over the brightness of it all, the general effect was quite pleasant. At least there were no radishes dangling from her ears.”
― J.K. Rowling, Harry Potter and the Deathly Hallows

“Hello' said a vague and dreamy voice from behind them. Harry looked up: Luna Lovegood had drifted over from the Ravenclaw table. Many people were staring at her and few people openly laughing and pointing; she had managed to procure a hat shaped like a life-size lion's head, which was perched precariously on her head.
'I'm supporting Gryffindor' said Luna, pointing unnecessarily at her hat. "Look what it does...'
She reached up and tapped the hat with her wand. It opened its mouth wide and gave an extremely realistic roar that made everyone in the vicinity jump.
'It's good, isn't it?' said Luna happily. 'I wanted to have it chewing up a serpent to represent Slytherin, you know, but there wasn't time. Anyway...good luck, Ronald!”
― J.K. Rowling, Harry Potter and the Order of the Phoenix

“I enjoyed the meetings, too. It was like having friends.”
― J.K. Rowling, Harry Potter and the Half-Blood Prince

“I've never stunned anyone except in our D.A. lessons," said Luna, sounding mildly interested. "That was noisier than I thought it would be.”
― J.K. Rowling, Harry Potter and the Deathly Hallows