Mulder

and Scully. Two who, after 9 seasons, a movie, a second movie (terrible) in 2008, a child, a final kiss in the aforementioned terrible film, and a well-defined romantic relationship (it was about time), still aren't aware of the existence of PROPER NAMES or at least their function. In 15 years, they have probably called each other by name 4 times (maybe). The most unsettling X-Files.