Original work or fan fiction?

[Aurimasp]

Would a story with some DOOM (the FPS game) elements and a doom slayer-esque character be considered fan fiction?

 

[RepresentingCaution]

Only if it uses the exact same names as those elements.

 

[Poleg]

Would a story with some DOOM (the FPS game) elements and a doom slayer-esque character be considered fan fiction?

steal what you like, change everything you dislike.
An original (but inspired) story.

 

[Cipiteca396]

Set it in a fantasy world, you could call it... Goblin Slayer! Or maybe Demon Layer.

Oh~ oh, how about Mayhem(2023)?

 

[TheEldritchGod]

https://tvtropes.org/pmwiki/pmwiki.php/Main/SerialNumbersFiledOff