Asa Mitaka is a high school student and the main protagonist of Chainsaw man. Her appearance is characterized by her average build and height, brown eyes that brighten when surprised, and black hair styled in twin tails. Initially, she is unsociable and dislikes her classmates, but underneath her mean-spirited attitude lies low self-esteem and fear of rejection. Asa's character development involves learning to confront her negative perceptions of herself and others, as well as appreciating life.