Would it be cultural appropriation if a Chinese person came across an American story and was inspired to write something with a similar character and plot? Nope. It’s just being inspired by another artist’s work. (The bigger concern would be plagiarism, but even that seems unlikely in such a situation.)
Of course, I’m also of the opinion that even specifically cultural inspiration can be used if it’s done respectfully and with research.
Fantasy/dystopian/sci-fi author. Mythology nerd. ENFP. Singer.