Question: What are some characters of series produced by Ricky Grevais?
SPARQL query: SELECT DISTINCT ?uri WHERE { ?x <http://dbpedia.org/ontology/executiveProducer> <http://dbpedia.org/resource/Ricky_Gervais> . ?uri <http://dbpedia.org/ontology/series> ?x  . }
Answer: The fictional characters whose series's executive producer is Ricky Gervais are [answer].