I'm afraid I can't name the main characters in the 'black and blue short story' as we don't have enough details. However, in a story with such a title, the main characters could be those who are at the center of a story of pain and recovery. For instance, it could be a young adult who has been bullied at school and is left feeling black and blue both physically and emotionally. There might also be a supporting character, like a teacher or a friend, who tries to help this person get out of their black and blue state. Or it could be a story set in a more historical or fictional world, where the main characters are soldiers who come back from war black and blue in spirit and body, and the story follows their journey of rehabilitation.