In which TV series is Steve Harrington a main character?

Who played Alexis Rose in 'Schitt's Creek'? In which TV series is Eleven a main character? Who played Joyce Byers in 'Stranger Things'? Who played Steve Harrington in 'Stranger Things'? Who played Dustin Henderson in 'Stranger Things'? In which TV series is Dustin Henderson a main character? Who played Mike Wheeler in 'Stranger Things'? Who played Dolores Abernathy in 'Westworld'?