Gilbert and Sullivan change the characters, which Sullivan found artificial and lacking in "human interest and probability", as well as being too similar to their earlier opera, "The Sorcerer". As dramatised in the film "Topsy-Turvy", the author and composer were at an impasse until 8 May 1884, when Gilbert dropped the lozenge idea and agreed to provide a libretto without any supernatural elements. The story focuses on a "cheap tailor," Ko-Ko, who is promoted to the position of Lord High Executioner of the town of Titipu. Ko-Ko loves his ward, Yum-Yum, but she loves a musician, who is really the son of the
Robert the Devil (Gilbert) later be a defining part of his work. These led to Gilbert's more mature "fairy comedies", such as "The Palace of Truth" (1870) and "Pygmalion and Galatea" (1871), which in turn led to the famous Gilbert and Sullivan operas. Although Gilbert gave up direct parodies of opera soon after "Robert", his parodic pokes at grand opera continued to be seen in the Savoy operas. The title character, a breeches role, was played as an insouciant "swell" by Nellie Farren, who became famous as the theatre's "principal boy". Gilbert later renounced "travesti" roles and revealing dresses on his actresses, and made