Vladimir Propp

Propp believed there are 8 key character roles:
1) Hero (protagonist)
2) Villain (antagonist)
3) The donor (provider)
4) The helper (assistant)
5) The father (gives advice)
6) The dispatcher (sends hero on mission)
7) The Princess
8) The false hero

To test this theory i did some research and found that films such as; Die Another Day, Golden Eye, Batman The Dark knight and The Matrix all follow this structure and as you can see these are mainly mainstream Hollywood films.

Now lets test the theory on Batman The Dark Knight
1) Hero - Batman
2) Villain - Joker
3) The donor - Morgan Freeman
4) The helper - Alfred
5) The father - Alfred
6) The dispatcher - Commisioner Gordon
7) The Princess - Rachel
8) The false hero - Harvey Dent

As you can see the Dark Knight fits the structure, however not all films do this such as, Blue Valentine and Momento, which toally go against this structure.