Back in 2012, when "The Avengers" was in the making, the filmmakers had a tough task at hand. They needed to tie all the heroes together within a reasonable runtime, which meant that many supporting characters from the lead-in films didn't make the cut.
However, one character who did have a significant role in the film was Pepper Potts, played by Gwyneth Paltrow. And it was all thanks to Robert Downey Jr., who portrays the iconic Iron Man. In an interview during a press junket before the film's premiere, writer-director Joss Whedon revealed his initial plan to exclude most of the supporting characters from "The Avengers.
She has played a crucial role in Tony's evolution as a character, ultimately leading to his self-sacrificial move in "Avengers: Endgame." From being a selfish billionaire/playboy/philanthropist to a husband and father ready to make the ultimate sacrifice, Tony Stark wouldn't have been able to grow over the first decade of the Marvel Cinematic Universe without Pepper's influence.