Harry Potter: About Transmigrating into the Marauders' Era as an NPC

A mountain of personal headcanons, mixing in all sorts of settings from a bunch of different fandoms.

First-person POV warning! The male lead used to be the heroine's friend, was female, and later transmigrated into a man's body!!

I thought it couldn't get any more ridiculous, but then I ran into my friend who became a male witch, a Fourth Calamity who brings NPCs a dozen sacks of gifts every day, and Sirius Black, who became severely afraid of women with help from the players. Slytherin and Gryffindor have several extra tables, the grade sheet has over 180 straight-A overachievers, extinct Pure-blood families have gained dozens of new family members, and Hogsmeade, Diagon Alley, and Knockturn Alley have all grown by several hundred square meters...

Please don't post NPCs' likes and dislikes on the confession wall, okay?! Why are you all acting like this is completely normal, okay?! Are the conquest team members workhorses from a production team? Please stop switching accounts back and forth to farm different affection scores from me, okay?! Am I the cafeteria lady? One after another, you're all asking me questions.

Help, why are there only forty-something Hufflepuffs? That's so different from Slytherin's two hundred-plus!

Why are there over sixty people in the kitchen in the middle of the night? Why are the tables at this British school full of spicy Chinese food? Why is everyone a Quidditch player? Where did all these teams come from?!

Anyway, my hilarious life at Hogwarts officially begins!

(Heads-up: Lots and lots and lots of personal headcanons. The protagonist doesn't get straight O's, but her golden finger is still a little overpowered. Slightly otome-oriented.)

Theme: Even when everyone around you is acting silly, you still have to study hard