Fictional alter ego is a term used to describe a character in literature or other media that is a version of the protagonist, but with different characteristics. The two crossword solutions for this term are Hyde (4 letters) and MrHyde (6 letters). Hyde is a character from Robert Louis Stevenson's novel 'The Strange Case of Dr. Jekyll and Mr. Hyde' who is the evil alter ego of the protagonist, Dr. Jekyll. MrHyde is the name given to Hyde when he is in his transformed state.