The main topic in this research is changes in the main character as a person with Asperger's syndrome in Kathryn Erskine’s Mockingbird. The process of this research involves the whole story, intrinsic elements: character and characterization, conflict, and setting. This qualitative research is supported by descriptive analysis method and library research technique that shows the main character as a person with Asperger's syndrome can experience character changes even though the research states that person with this syndrome is quite difficult to progress in terms of social interaction. A person with asperger syndrome has a persistent nature, but gradually the main character is able to pass through all the processes of change in her life. Keywords: character changes; asperger syndrome; main character.
                        
                        
                        
                        
                            
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