Can a placeholder Librarian be happy?

NPCs, placeholders and nameless background characters all hold the same purpose: to fill in the blank for the main characters to shine. From the noble ladies behind all the textbox in Manhwa or Manga to trained Knights that got beaten by a mere child to the one who just there to make a classroom feel a bit crowded in school settings, everything to make the story feel alive but... are they? What if, one of them suddenly realise that they're someone who are worthless in the eyes of the authors?
They don't have a face but they have voice with only purpose to give some kind of exposition about the MCs or to show either disdain or put them on a pedestal or... nothing... nothing at all. Useless, nameless background characters that doesn't effect anything to predetermined story.

This story took place in a school life harem-comedy but our protagonist is not apart of the story. He's a librarian. A normal, generic, four eyes who always have a stern look and gave MCs warning or kicked them out every time they make a loud noises in a library for comedic purpose. That is his only role.

One day, after he's about to finished his work for the day, he had the worse headache imaginable to the point that he collapsed on his desk. From there, he gain something. Something that will change his perspective of his world. He realised that he is just a placeholder in this world.

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This story is inspired by a character in the book titled 'The Simulacrum' from Scribble Hub written by Egathentale and some key elements
from "Extraordinary You".

Comments are appreciated!