When I began watching District 9, I really was not sure what to expect. The audience is dropped into the middle of a documentary of sorts and it is obvious there is an incredible back story of which we're still missing some important pieces. However, it is this sense of detachment that brings out the true themes of the film – xenophobia and the idea that being human does not necessarily come automatically with the DNA. In the beginning, Wikus is a seemingly inhumane character who cannot feel any empathy whatsoever for the "prawns." Because of this, it is hard for the viewer to even like him as a person - until the movie takes a drastic turn as Wikus makes his own transition.
After this point, the film feels less like a documentary and more like a classic action alien movie, as we become more attached to the main character and Christopher. It is clear through his actions, that Wikus becomes more and more human as his physical characteristics deteriorate into more alien attributes. At the end of the film, when the transition is made back to the documentary style, the viewer is once again more physically detached from Wikus and his story, but at this point, we are more drawn in and curious about his future and well-being.