Red Hulk Could Have Starred in The Avengers: Endgame
MCU’s The Avengers: Endgame saw a great amount of diversity in the superheroes that were featured in the movie. The film was a combination of almost all the actors in the Marvel franchise and was received by the audience as a pure work of art. However, during the making of every film, it is a must for directors to choose and select certain roles whilst over others.
Red Hulk in The Avengers: Endgame

During the making of the film, the character of Red Hulk was considered for a brief time before it was turned down. “I entertained the idea for about a day,” co-writer Christopher Markus told Backstory Magazine. Why this question arose was due to the red-tinged glow on the smart Hulk played by Mark Ruffalo after he performed the snap to bring the vanished population back.
Red Hulk before Endgame

Although we do not see much of the Red Hulk in the MCU movies, he has procured a prominent place in the comics. According to the comics, the character of Thaddeus Ross had the ability to change into Red Hulk. This version of the Hulk was considered a prominent villain as opposed to the green Hulk.
In the Marvel movies, General Thaddeus “Thunderbolt” Ross appears for very small durations. He is seen at Tony’s funeral in The Avengers: Endgame.
“I don’t know. I wouldn’t mind feeling like I had that much power,” Hurt told The Wall Street Journal. “But I created Thaddeus’ ego with the same size as the monster’s. With the same degree of messed op-ness. I’d take a shot at it,” he explained.
Furthermore, Marvel Studios president Kevin Feige revealed that there could be a future for Hulk and his red enemy post The Avengers: Endgame.
Sources: comicbook, marvelcinematicuniverse