Films depend on a strong cast of characters to carry a story, with a main protagonist being the driving force. However, it's not at all uncommon for supporting characters to outshine the lead in their own story. This can happen for a range of reasons, from superior star power of a supporting character to them being written with some of the film's best lines. Regardless of the reason, some of the greatest characters in cinema were never meant to be the main star.
Source：https://www.cbr.com/movies-best-supporting-characters-stole-show/
