This is one of the best films ever made. Yes, it’s dark. And yes, it has violence and gore in it.
The main character, Ofelia is a lovable, young girl. She makes mistakes in the movie that show the realistic attitude of a child her age.
I saw someone say that there was no labyrinth in this movie, but there is. A labyrinth is a maze. The maze in the movie is what she goes into at least three times throughout the movie.
Would I let a child watch it? Yes. Growing up, I watched things just like it. I personally don’t think it’s too bad. There is some mild language. Considering it’s in Spanish, you’ll need subtitles on. And if your kid can’t read, then they’ll still be entertained by the great characters and costumes.