Everybody is Luna
"No," said Harry angrily and randomly.
"I'm sorry. What?" Ron and Hermione had no idea what the fuck Harry was talking about. They were sitting with him, Luna, Neville, and Ginny in a compartment on the Hogwarts Espresso together, even though it was the middle of August.
"Shut up! You have no idea what it's like to be me!"
"No one has any idea what it's like to be another person," said Luna, "unless we use Polyjuice, in which case we actually do. And that means I do know what it's like to be everyone at Hogwarts, since I've impersonated all of them at one time or another."
Harry disregarded this statement because he was too busy being a bitch to think about how useful it was to have someone on his side who could impersonate anyone at all without getting caught and had an apparently infinite supply of Polyjuice.
"Sirius and Cedric died and it's all my fault!" Harry screamed, waving his hands in the air like an idiot.
"No it's not, Harry," said Ron calmly. "It's Bellatrix Lestrange's. And, to a lesser degree, Voldemort's. You didn't do anything except disregard everyone all year and put your friends in danger repeatedly for no reason other than that you don't know how to listen to anyone else."
Harry fumed.
"You're all against me," he decided after a while. "Dumbledore must be paying you all to be my friends so he can manipulate me into being the weapon he wants! You bastards! I won't be your puppet anymore, Dumbledore! This puppet is cutting his strings! I'm going to sneak away to Gringotts and reclaim the name of Lord Potter for my own! I want my ring back!"
"There is no Lord Potter, Harry," Hermione informed him. "Your father got rid of the Potter seat in protest against a bill regarding Quidditch balls because he was a hippie douchebag who didn't give a shit about anything."
"DON'T YOU INSULT MY FATHER! I knew you were all against me! You've had me under potions, too! I know it! You bastards! You won't get away with this, Dumbledore! I'll be my own man now!" Harry threw some stuff at the walls before continuing. "He's been limiting my magic, and he told the Dursleys to abuse me, and he killed Sirius so I'd have to stay with them, and he probably had Voldemort kill my parents, and -"
"Oh for fuck's sake, enough of this shit," said Luna. She pulled out a .44 caliber revolver and shot Harry in the head, killing him instantly.
"What a waste," Ron said, shaking his head sadly.
"Not really," said Neville.
"Hmm, I suppose you're right."
All of Harry's friends turned back into Luna Lovegood and went about their daily business. At first, people were upset by the increased number of Lunas, but then it turned out that they were also Luna too. In the end it was all fine because everybody was Luna.