Myumara
Everything comes from somewhere. You're describing cliche's. Some authors follow them. Others break them. Others invent entirely new ones over time. My point is that all of it has to be explained. The reader doesn't know until I tell them.
Let's use the below sentence as an example for both a original novel and a fanfic. I'm being super lazy and writing a crappy sentence just to make the point.
'Roger lived in Treeleaf village. It's a ninja village in Greenwood country. The village existed in a large forest.'
Original: Now the reader knows that Roger is somebody living in a village in a country. What world? Do they dress in black clothes and throw ninja stars? Or do they have amazing powers that allow them to become superhuman? How big are the trees in the forest? Whats the architecture style?
Naruto fanfic: The reader can probably guess the architecture. They may be able to guess the rough location in the world depending on the quality of the writing and how big a fan they are. They know that ninjas are superhuman more similar to superheros than ninjas. They probably wear a variety of stylized clothes instead of plain black ninja outfits. They know what the ninja need to do to get stronger.
My own novel as another example. I introduced a mech suit. Okay, what is a mech suit? Is it a giant 20 story tall robot that shoots laser beams? Is it a 6 feet tall exoskeleton that the user wears? In my case it was a steam powered 10 foot tall mech that moved clumsily. It didn't have hands and blasted hot water towards enemies. It shone a bright bronze hue. If it was Gundam or Code Geass then the reader knows exactly what they look like, how they work, and what to expect.