One who assigned attributes or positions to oneself and then believes one has them. A Self-Styled person will decide that s/he is something without any real proof of such and expect others to accept it.
When someone is described as 'Self-Styled' it usually indicates that they are not actually what they consider themselves.
DJ. Jon MacDeeboy was a Self-Styled 'Controversial Rapper'. Although his lyricsseemed very conventional.