question: Which person was a Japanese person 's actor
query: SELECT DISTINCT ?x0 WHERE {
  ?x0 a ns:people.person .
  ?x0 ns:film.actor.film/ns:film.performance.character ?x1 .
  ?x1 a ns:people.person .
  ?x1 ns:people.person.nationality ns:m.03_3d
  }