Question: What part of the original work should an adaptation retain
Answer: It should always retain as much of the flavor of the original story as possible.
Explanation: Adaptation in literature is the action of transposing from one medium to another by adapting a literary source like a novel, short story or poem, to another genre or medium, such as a film, stage play, video game, etc. Adaptation allows the modifications of many things, however, it should always retain as much of the flavor of the original story as possible. It is important for the audience to identify with the characters and the plot just like they did in the book, novel, poem, etc.