Every human in your dream will represent an idea you have and reflect an aspect of yourself. As the characters you create are obviously fictional characters, if they were to appear in your dreams they would suggest aspects or qualities of yourself that you can only but image yourself as having.
It is possible that since you might regard one of your characters as reflecting a creative aspect of yourself, that these characters are not required in your dreams – because you already acknowledge your creativity and do not need to imagine yourself as having such ability. Since dreams are God’s way of correcting one’s thinking, it is also possible that pertaining to your own thought life, there is nothing that can be corrected via one of your created characters. If your special character possesses a particular quality or ability, would it be one you are to only imagine yourself as having?