How to not suck at jeff the killer fanfictions

Who is you mary sue?

Every book has the beautiful girl, blonde hair, blue or green eyes, is breath taking.
Or, has black hair with bright eyes, her hair has the tips dyed or something cliche. She wears all the band merchandise and wears beanies all the time with black eyeliner and is into like Black veil brides, or pierce the veil. Or whatever it is
Wow, like I haven't seen that in the many books I've read, why not change it up?
Make them, normal maybe? With a normal look? Like tee shirts and jeans and tennis shoes? Or sweatpants and shirts, and hey? Why not make them self conscious like a normal person? Wear baggy shirts like normal people who are scared of their look since not all of us are stick thin and pretty? We are humans who aren't rich, fuck I'm not rich enough to own all that band shit! I wear sweatshirts and jeans or shorts all day for, all seasons. No kidding I wear the same exact think every day unless I have to wash it!

Thanks again to My_smile_went_insane
If anyone wants a topic you want me to cover in my angry asshole like way, leave it in the comments or message me either way I'll help you out!