Question: Ricky Gervais is the executive producer of the series having how many fictional characters?
SPARQL:
SELECT DISTINCT COUNT(?uri) WHERE { ?x <http://dbpedia.org/ontology/executiveProducer> <http://dbpedia.org/resource/Ricky_Gervais> . ?uri <http://dbpedia.org/ontology/series> ?x  . ?uri <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/FictionalCharacter>}