Who played Peter Quill in 'Guardians of the Galaxy'?

In which film is Clint Barton a character? Who played Nick Fury in 'The Avengers'? In which film is Nick Fury a character? Who played Thanos in 'Avengers: Infinity War'? In which film is Peter Quill a character? Who played T'Challa in 'Black Panther'? In which film is T'Challa a character? Who played Erik Killmonger in 'Black Panther'?