Warnings: A bit of spoilers if you don't know about Sans from Undertale.
Backstory: Peter Parker is really a certain skeleton from Undertale. He keeps his true self hidden, and no one knows about his real abilities. Includes some headcannons about Sans' powers/magic. Pre-Homecoming, Before/during CA:CW.
Peter knew he wasn't normal.
Normal kids didn't remember living in a big cave underground.
Normal kids couldn't see ghosts and supernatural creatures.
Normal kids couldn't move things with their minds.
Normal kids didn't have the ability to make themselves look like whatever they wanted to.
Normal kids had skin, and muscle, and hair, not bones held together by something unknown.
Normal kids couldn't summon giant dragon-wolf skulls that could vaporize anything with a beam of light.
Normal kids couldn't teleport and see a person's soul.
So Peter wasn't normal.
He lived with his aunt, and went to Midtown Technology and Science High School; basically a private school for smart kids. When Peter was 4, his parents had supposedly dropped him off to stay with his aunt and uncle. Then their plane crashed, and they were dead. Peter's uncle was shot and killed when he was 13, leaving his aunt to try and support the two of them.
Ever since he came to live with his aunt and uncle, Peter could change his appearance. It wasn't hard; he just thought about not looking like himself, something would hum softly in his ribcage, and then he'd look different.
No one ever could surprise him. He could always see or hear them coming, through little windows in space he could create. His "shortcuts" let him grab things, see or hear stuff, and even look to see if someone was where he was going to teleport to.
A few days after his fourteenth birthday, Peter teleported into his apartment complex's elevator, having checked to make sure there wasn't anyone there, first. He had his earbuds in - how they didn't fall out of his skull, he never knew - and his backpack slung over his shoulder.
Someone was inside his apartment when he got there. Two people, actually, Aunt May and someone else. Silently, Peter found his keys in his jacket pocket with his left hand and summoned a small bone in his right pocket. He unlocked the door, and slipped through.
Acting like he had no idea that someone was in the room, Peter went right into the kitchen, tossing his keys at the table
A/N: Just a little weird thought I had about Peter being Sans. Started as Peter being able to see souls, and it snowballed into this little thing from there. Idk. Undertale is great.