It started with a refrain of “Come to Brazil.” After “Stranger Things” premiered on Netflix in July 2016, a then-13-year-old Finn Wolfhard logged on to Instagram to find he was rapidly going from unknown Canadian kid to one of the most recognizable young actors in the world. As the flood of three-word requests from new South American fans poured in and his follower count skyrocketed, Wolfhard looked on agape.