Krystle

“Where is Wood?" said Harry, suddenly realizing he wasn't there.
"Still in the showers," said Fred. "We think he's trying to drown himself.”
― J. K. Rowling, Harry Potter and the Prisoner of Azkaban

“I want to commit the murder I was imprisoned for.”
― J.K. Rowling, Harry Potter and the Prisoner of Azkaban

“Have you ever seen anything quite as pathetic?" said Malfoy. "And he’s supposed to be our teacher!"
Harry and Ron both made furious moves toward Malfoy, but Hermione got there first - SMACK!
She had slapped Malfoy across the face with all the strength she could muster. Malfoy staggered. Harry, Ron, Crabbe, and Goyle stood flabbergasted as Hermione raised her hand again.
"Don’t you dare call Hagrid pathetic you foul—you evil—"
"Hermione!" said Ron weakly and he tried to grab her hand as she swung it back.
"Get off Ron!"
Hermione pulled out her wand. Malfoy stepped backward. Crabbe and Goyle looked at him for instructions, thoroughly bewildered.
"C’mon," Malfoy muttered, and in a moment, all three of them had disappeared into the passageway to the dungeons.
"Hermione!" Ron said again, sounding both stunned and impressed.”
― J.K. Rowling, Harry Potter and the Prisoner of Azkaban

“Harry!" said Fred, elbowing Percy out of the way and bowing deeply. "Simply splendid to see you, old boy-"
"Marvelous," said George, pushing Fred aside and seizing Harry's hand in turn. "Absolutely spiffing."
Percy scowled.
"That's enough, now," said Mrs. Weasley.
"Mum!" said Fred as though he'd only just spotted her and seizing her hand too. "How really corking to see you-”
― J. K. Rowling, Harry Potter and the Prisoner of Azkaban