Red Oni, Blue Oni/Theatre


 * Vladimir and Estragon in Waiting for Godot
 * In Rosencrantz and Guildenstern Are Dead, Rosencrantz is red and Guildenstern is blue.
 * Hamlet (red) and Horatio (blue), conforming to the Zeroth Law of Trope Examples.
 * In the movie version of the musical Jekyll and Hyde (yes, the one with David Hasselhoff), Dr. Jekyll is shown with a red light (hard to tell in this picture, sorry) and Hyde is shown with a blue light shining on him
 * Romeo and Juliet gives us Romeo (red) and Benvolio (blue), Mercutio (red) and Benvolio (blue), and even Romeo (red) and Juliet (blue).
 * To a degree, Henry Higgins (red) and Colonel Pickering (blue) from Pygmalion and My Fair Lady.