Charlot
That was actually the first film featuring the Tramp but a different film, shot later but with the same character, happened to be released two days earlier. The Tramp debuted to the public in the Keystone comedy "Kid Auto Races at Venice" (released on 7 February 1914; "Mabel's Strange Predicament", shot earlier, was released on 9 February 1914). Chaplin, with his Little Tramp character, quickly became the most popular star in Keystone director Mack Sennett's company of players. Chaplin continued to play the Tramp through dozens of short films and, later, feature-length productions. (In only a handful of other productions did he play characters other than the Tramp).