One main theme is secrecy. The heroes' secrets play a huge role in the story. Another is morality. The actions of the heroes are put to the test morally.
Well, in the 'Identity Crisis' DC Comics graphic novels, there are several important themes. The theme of betrayal stands out. There are instances where the heroes' actions towards each other can be seen as a form of betrayal. Also, the theme of power and responsibility is there. The heroes have great power, and the story explores how they handle the responsibility that comes with it. Additionally, the theme of loss is present. Some characters experience loss, whether it's the loss of a loved one or the loss of their own sense of self - worth.