In which film is Ryan Stone a character?

Who played Jack Twist in 'Brokeback Mountain'? Who played Louis Bloom in 'Nightcrawler'? In which film is Louis Bloom a character? Who played Ryan Stone in 'Gravity'? Who played Louise Banks in 'Arrival'? In which film is Louise Banks a character? Who played Joel Barish in 'Eternal Sunshine of the Spotless Mind'? In which film is Joel Barish a character?