I think Buster would really enjoy this one but it might be a bit scary for Russter. There were a couple of scenes that the boy felt was a trifle scary for him. No graphic violence but some stylized and highly suggested violence. The IMDB site has a parental recommendation of Okay for small children as rated by actual parents.
As for the adults on the board I think many of them would find the story and the animation very well done.
Kubo and the Two Strings is a 2016 American 3D stop-motion fantasy action adventure film, directed by Travis Knight, written by Marc Haimes and Chris Butler, and produced by Laika. The film features the voices of Art Parkinson, Charlize Theron, Matthew McConaughey, Ralph Fiennes, Rooney Mara and George Takei. It was released by Focus Features in the United States on August 19, 2016.