If there is one moment in the MCU that made everyone emotional, one could argue that it was Tony Stark's sacrifice in Avengers: Endgame. Ever since Robert Downey Jr.wore the iconic red-and-yellow suit in 2008, he became a beloved superhero in cinema, when not everyone knew who this Marvel hero was. Fans watched this character for 11 years, only for him to make the ultimate sacrifice that not only ended Tony's character on a good note, but also the Infinity Saga as a whole.