If you have become a dictator in a dream, then it shows the dominant features in your personality. You are the person who wishes to control as much as it is possible, even if it includes lives of others. The dream may be suggestion to start being less dominant and approve other peoples opinions. The dream about dictator could also indicate the person in your waking life that has much influence to your own life.
Read more about dreaming of Dictator in other dream meanings interpretations.