Neither of them conforms to typical mainstream simplicity. Funny Valentine's actions and motives are deeply rooted in the complex lore of JoJo's. Pulp Fiction's plot structure and character development are far from the ordinary Hollywood formula. They both break away from the norm, whether it's in the context of a manga/anime or a movie.
He probably wouldn't fit in well at first glance. Pulp Fiction's world is more grounded in a somewhat realistic, albeit highly stylized, criminal underworld. Funny Valentine, with his supernatural abilities from JoJo's Bizarre Adventure, would be an outlier. But if you think about it, he could potentially be a new kind of power - hungry antagonist in the seedy criminal world, using his stand powers to manipulate situations for his own gain.
Faye Valentine is not a character in Pulp Fiction. There is some misinformation in your title. Pulp Fiction has characters like Vincent Vega, Jules Winnfield, etc., but no Faye Valentine.
It's subjective. Pulp Fiction has elements of humor, but it's a mix of comedy, drama, and violence. If you appreciate Tarantino's style, you might find it funny in parts.
It can be seen as funny in a dark and satirical way. The unconventional plot and quirky characters often bring out elements of humor that are not your typical kind.
The humor in Pulp Fiction comes from its offbeat characters and the way they interact. The non-linear storytelling also adds to the fun as it keeps you on your toes.
In Pulp Fiction, some people might try to make funny memes about the more edgy and out - there scenes that could be misconstrued as drug - related. But this movie is more about the intertwined lives of criminals in Los Angeles. Quentin Tarantino, the director, was aiming for a gritty and stylized portrayal of the underworld, not to encourage drug meme - making. So while some might find humor in making such memes, it doesn't really do justice to the overall artistic value of the film.