idol vs lead character

idol

noun
  • A cultural icon, or especially popular person. 

  • A popular entertainer, usually young, captivating and attractive, and often female, with an image of being close to fans. 

  • A graven image or representation of anything that is revered, or believed to convey spiritual power. 

lead character

noun
  • The main protagonist in a work. 

How often have the words idol and lead character occurred in a corpus of books? (source: Google Ngram Viewer )