"Ko-Ko" is a character from the comic opera "The Mikado," composed by Arthur Sullivan with a libretto by W. S. Gilbert. He is the Lord High Executioner of Titipu, a fictional Japanese town, and is known for his humorous and bumbling personality. Ko-Ko's character often finds himself in absurd situations, particularly regarding his duties and the law. In the story, Ko-Ko is tasked with executing a criminal but faces challenges due to his own incompetence and the absurdity of the laws he must enforce. His character highlights themes of authority and the ridiculousness of societal rules, making him a memorable figure in the operatic world.