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scrooge mcduck
I think you must mean the 1964 movie "My Fair Lady. " The two main characters are Professor Henry Higgins (played by Rex Harrison) and Eliza Doolittle (played by Audrey Hepburn).
There are two main characters in Mamma Mia - Donna(played by Meryl Streep in the movie version) and Sophie (played by Amanda Seyfried in the movie version).
The main character in the movie "Gladiator" is Maximus Decimus Meridius, played by Russell Crowe. Other significant characters include Commodus, played by Joaquin Phoenix, and Lucilla, played by Connie Nielsen.
The main characters in the 2001 movie, Legally Blonde are Elle Woods played by Reese Witherspoon and Emmett played by Luke Wilson. Other prominent characters in the movie are Vivian Kensington, Warner and Professor Callahan.
The main characters are played by Frankie Muniz and Hayden Panettiere.
The four main characters in the film White Christmas were played by Bing Crosby , Danny Kaye , Vera Ellen And I believe Jane Russell.
The main characters in the movie "Jackie" are Jackie Kennedy, played by Natalie Portman, and various supporting characters such as John F. Kennedy, Bobby Kennedy, and Nancy Tuckerman.
The two main characters were played by Wesley Snipes and Woody Harrelson
The characters that appear the most in a movie. If you are talking about a specific movie please give a title
9 main characters
Your question is somewhat difficult to interpret, but perhaps what you mean to ask is, why do some movie characters work better as main characters than they would as minor characters. The answer would be that if the more interesting characters are the main characters, then the movie itself will be more interesting.