The character most used in film? Elementary, my dear Watson. The most popular subject of film of all times is Sherlock Holmes. There are 197 film about him! Holmes is a detective in stories by sir Arthur Conan Doyle. He of ten says. Elementary, my dear Watson"to his friend , Dr . Watson, to show hom easy it is to understand something. Second in the list of popularity is Napoleon followed by Dracula, starring in 155 films.