Mattheo Riddle// Little Potter...

Harry Potter "the boy who lived" and Elizabeth Potter "the girl who survived, 16 years ago. Who was the killer? Voldemort.
"You Know Who" planned to kill their children, but he failed in this mission and as a side effect left a lightning scar on Harry Potter's forehead, while on Elizabeth Potter the spell ended up going to her hair, she was brunette and suddenly her hair turned blonde.

After all this happened, Voldemort never returned to kill the twins, no one knew why, but everyone knew that at some point he would return, he would return 1000x worse! Dumbledore, the headmaster of Hogwarts School of Witchcraft and Wizardry and a close friend of their parents, decided to take their siblings to the Muggle world to live with their uncles, hiding all the truth about their parents, surname, blood and such... 10 years after the accident they received the famous Hogwarts letter and with that they went to study there, arriving there they gradually discovered the truth and realized that everyone knew them because of the famous surname.

Something nobody imagined happened at Hogwarts, at the time of the house sorting the Potter family had a history of going to Gryffindor, her brother Harry went to Gryffindor as expected, Elizabeth Potter went to Slytherin! This was the last straw, a Potter in Slytherin was unimaginable, with this she ended up suffering a bit of bullying because besides being a Slytherin causing a kind of "disgust" she was also a blood traitor, in Slytherin, Lizzie ended up meeting Mattheo Riddle, that's right, Voldemort's son, the same one who killed her parents and tried to kill them, from the beginning they hated each other, the feeling was mutual, they never got along and always provoked each other, he was very popular in Hogwarts.