Hi again! So i took a peek of your random book idea, it's actually interesting, but there are many adjustments that have to be made for the story and the characters background stories regarding their future entanglements to the reader whom, if you probably mean dabi by Dabi from MHA.
I would love to make an example on that random book, but unfortunately I'm unfamiliar with the fandom of FPE, but i have played that game once with a VERY close friend of mine in roblox.
It is nice to have your fanfic ideas written here, i too have so many of my own ideas but couldn't write it down because of so many things to change it up for the story to flow and have the readers understand what the plots are going to be.
Keep your imaginations going (*´ω｀*) who knows, if you keep writing your story ideas, you will inspire other authors who will visit your profile.
