Since Martin Freeman will appear in Captain America Civil war, some have come to speculate who he will play. Some believe he is Henry Peter Gyrich, or Spiderman.
In Marvel comics Spiderman's role was crucial for Civil war, he originally fought alongside Captain America, because Peter Parker believed that he and other superhero's deserved privacy and a secret identity. Even though Spiderman apposed Iron man he eventually joined him and revealed his secret identity to the world.
Henry Peter Gyrich was the avenger liaison, he could possibly be played by martin freeman to add tension to the movie.