Mary Potter and The Philosopher's Stone (Harry Potter's Transgender Twin Sister)

Voldemort

"You all right, Harry, Mary, You seem very quiet" asked Hagrid as they sat eating lunch at the leaky cauldron.
"He killed our parents, didn't he? The one who gave us these scars. You know, Hagrid, I know you do" Harry asked.
"First, and understand this, Harry, Mary, 'cause it's very important. Not all wizards are good. Some of them go bad. A few years ago, there was one wizard who went as bad as you can go. And his name was V-...his name was V-..." Hagrid trailed off.
"Maybe if you wrote it down" suggested Mary.
"No, I can't spell it, All right, Voldemort" whispered Hagrid.
"Voldemort" asked Harry and Mary.
"Shh!!" hissed Hagrid.
"It was dark times, Mary, Harry, dark times. Voldemort started to gather some followers, brought 'em over to the dark side. Anyone that stood up to him ended up dead. Your parents fought against him, but nobody lived once he decided to kill 'em. Nobody...not one. 'Cept you two" explained Hagrid and the twins could've sworn there was a flash of green light.

"Us" asked Harry.
"Voldemort tried to kill...us" said Mary.
"Yes. They ain't no ordinary cuts on your foreheads. A mark like that only comes from being touched by a curse...and an evil curse at that" explained Hagrid.
"What happened to...to You-Know-Who" asked Harry.
"Well, some say he died. Codswallop in my opinion. Nope, I reckon he's out there, still, too tired to carry on. But one thing's absolutely certain. Something about you stumped him that night. That's why you're famous. That's why everybody knows your name. You're the twins who lived" explained Hagrid.
"And because I was a boy when I was born, and have lived in the Muggle world, the wizarding world don't know I'm a girl do they" asked Mary.
"Exactly, but they'll learn quick enough" said Hagrid. Harry hugged his sister, he knew how much it hurt her to be misgendered. Then Mary's kitten, who she had named Music, pounced on her foot making her smile.
She had named the kitten music because music meant so much to her, whenever Mary felt really sad or angry she would grab her guitar and start strumming country Roads or wagon wheel both were written before she was born, but she loved to play them.
"Hagrid, can I bring my guitar to Hogwarts" asked Mary.
"Probably, but you might get some funny looks from other wizards and witches" said Hagrid, although considering Mary had been cartwheeling down Diagon Alley, he guessed she probably didn't care about funny looks.