I've always wanted to do a reincarnation crossover :P as I don't have the patience to do a multi–chap about Luke being reborn in Harry, I'll just leave this here.
For the May The Fourth Be With You Event at The Golden Snitch. Prompt: galaxy.
Sometimes, Harry remembers a distant past from another world, another galaxy. He can feel two suns warming his days until the heat is unbearable and more than a single moon pulling the tides of a tiny ocean. Tatooine, he recalls in a voice not quite his own when he's at school, learning about the vastness of the space beyond.
From then, everything is both clearer and more confusing. One moment he's running away from Dudley and the next he's listening to a strange creature —Master Yoda, the voice in his mind tells him— about doing and not trying. So, instead of running away from Dudley, Harry confronts his Aunt and asks him why she lets Dudley treat him bad if they're his family?
It's a question Harry has been meaning to ask, but he never dares until the voice pushes him to it.
Aunt Petunia looks at him with loathing in her eyes and Harry hears the voice telling him not to hate her. Hate is not for the likes of them because hate makes them a danger to people. Harry has seen enough snippets of the voice's life to know hate only brings death.
Harry is, in reality, too young to understand what he sees. So, he ignores Aunt Petunia's hateful look and seeks something else inside him. The voice guides him, but they find nothing.
Harry doesn't let himself disappointed, because Dudley isn't hiting him anymore when Petunia isn't around and, for the first time in too much time, Harry feels some kind of emotion inside him that lets him sleep at night. It's not the burning sadness that makes his heart beat faster and faster until he chokes with tears; it's quiet and peaceful, and it lulls him to sleep like a mother's song.
So he asks his aunt why his mother isn't with him.
"She wasn't normal," Aunt Petunia spats and sends Harry to his cupboard. He pretends not to hear Aunt Petunia's voice breaking when she whispers those words, but now his heart has something similar to peace, because if Aunt Petunia is so hurt over his mother then that must mean she loves her even in death.
Harry thinks he can work with that.
That night he dreams of a boy being born from his sister, and how does he has a sister? She's the one with hair buns and a fierce look of determination in her eyes. Then, the boy grows up to be a murderer and the voice is lost in a galaxy far, far away. The thoughts of his sister never leave him. The thoughts of the boy, his nephew, also don't.
Maybe Aunt Petunia feels the same? It's so strange, because that nephew in another galaxy hurt the voice's sister, but Harry never hurts Aunt Petunia.
(That's what he thinks, because Petunia looks at him and sees only the eyes of the sister who died to protect that boy. She has to call him nephew. Here or in another galaxy, that hurts.)
Harry grows and learns about himself. About the Boy Who Lived and about the Only Hope of a galaxy. He is the first to survive a Killing Curse and the Last Force user who can stop a threat.
He only hopes Voldemort isn't his father.