Was a person that M1 was played by and M2 was played by influenced by a character
SELECT count(*) WHERE {
?x0 a ns:people.person .
?x0 ns:film.actor.film/ns:film.performance.character M1 .
?x0 ns:film.actor.film/ns:film.performance.character M2 .
?x0 ns:influence.influence_node.influenced_by ?x1 .
?x1 a ns:fictional_universe.fictional_character
}