V is a mysterious anarchist vigilante and freedom fighter, easily recognizable by his Guy Fawkes mask and dark clothing. V has a Military background in some form of Special Forces.
In the film, V is a freedom fighter rather than an anarchist terrorist. He is disfigured (a result of burns) instead of being described as being ugly. His physical abilities are unexpected results of myriad experiments performed on many if not all of Larkhill’s detainees.