In which film is Louis Bloom a character?

Who played Ennis Del Mar in 'Brokeback Mountain'? In which film is Ennis Del Mar a character? Who played Jack Twist in 'Brokeback Mountain'? Who played Louis Bloom in 'Nightcrawler'? Who played Ryan Stone in 'Gravity'? In which film is Ryan Stone a character? Who played Louise Banks in 'Arrival'? In which film is Louise Banks a character?