If you are a female and you had dreamed of a hero coming to your aid, it means you see yourself as needy in your life. You are unable to improve your circumstances and have wished for an external agent to rescue you from your troubles. This may not be a practical solution in real life as how many people actually get their own heroes to rescue them from situations?
This dream can give you hope, if you believe that a person is willing to rescue you from a bad situation.
On the other hand, you should think about solving your problem by using resources available to you, or asking for help from available sources.