The newest twist on hero and superhero flicks is to promote the sidekick to central figure. According to Deadline Hollywood, Johnny Depp has signed to play Tonto opposite Armie Hammer's masked man in Gore Verbinski's The Lone Ranger. How very Rosenkrantz and Guildenstern.
Recently, Jay Chou outlicked and outkicked Seth Rogen in Michel Gondry's The Green Hornet when his Chou's Kato upstaged Rogen's Britt Reid. (Originally when Stephen "Kung Fu Hustle" Chow was slated to direct Hornet, his proposal was that Kato would plant a microchip in Britt's brain and control him by joystick.)
Which other sagas might benefit from having the sidekick take center stage?