Children of Men and V for Vendetta : stock characters

The hero could be Theo however he does not hold the stereotypical conventions of a hero but is portrayed as a normal citizen. 

In v for vendetta this could be V or Evie

The villain could be the army or the oppressive fascist totalitarian government

This is more clear in V for Vendetta, as it is the government/ sutler  

The dispatcher; invites the hero to eliminate evil; Julian. Before meeting her again he is a normal passerby. Kee could also be seen as the dispatcher as her pregnancy gives Theo the reason. 

In V for Vendetta this could be Evie at the beginning before nearly being raped. 

The Helper; who helps the hero fight against evil. Jasper, Julian or the ginger woman.  

In v for vendetta this is Evie, before she reaches her character development. 

The Princess; rescued from evil; Kee as she needs help and protecting throughout the film

Evie needs saving at the beginning of the film. 

The Donor; offers help to the hero. This could be jasper as he gives Theo a car an sacrifices himself 

V for vendetta; this could be v's concentration camp for Evie as it teaches her to reach her character development or Diestrich.