Clamp's works span a wide variety of themes. As opposed to keeping consistent themes across their works or having individual themes for each work, Nanase Ohkawa stated "we come up with a new theme for each story. One thing to say each time." Their works often deal with the theme of human fate that relates to Ohkawa's view on life; Ohkawa believes that "fate is something you choose", not a "mystical force manipulating your destiny", and that with determination and resolve, "you can change your fate".