To dream of Batman represents confrontation with overwhelming adversity with superior intelligence or resources. Always having a perfect solution handy when you are facing a very big problem or crisis. Scaring people that they have to be honest with unusual resourcefulness. Feelings about yourself being an expert at never being told what to do.
Alternatively, the dream is a sign that there is some kind of wrongdoing that you feel the need to rectify.
Example: A young boy dreamed seeing killing a witch. In waking life the boy hated his nursery school teacher. He would hit, kick, and yell at her wishing that he could be rid of her from his life. Batman in this case may reflect the boy’s feelings about himself heroically using his intelligence to stand up to and embarrass his teacher.