Was a Mexican person influenced by M3 and influenced by a character M1
SELECT count(*) WHERE {
?x0 a ns:fictional_universe.fictional_character .
M1 a ns:people.person .
M1 ns:influence.influence_node.influenced_by ?x0 .
M1 ns:influence.influence_node.influenced_by M3 .
M1 ns:people.person.nationality ns:m.0b90_r
}