Lady Death is a prominent character in The Infinity Gauntlet comics, but it seems she will not appear at all in the movies.
Why Is Lady Death Not In 'Avengers: Infinity War'?
According to the Russo brothers, Anthony and Joe, Avengers: Infinity War and Avengers 4 are not necessarily faithful to the events of the comics.
"We're telling the story of the Marvel Cinematic Universe, not the Marvel Comic Universe," Joe told Screen Rant.
"Borrowing elements and the mojo from it but in completing this giant mosaic of the story that's being told in these movies, not in those books, which is why death is not in this film."
He added that he's not interested in retelling the exact story of the book. Instead, he wants to surprise his viewers. That's why the lady is not appearing to usher in the characters who will die in the film.
Stephen McFeely, the screenwriter of Infinity War, previously stated that the movie is still grounded in reality despite of the superheroes and cosmic forces. The personification of death apparently doesn't fit, presumably along with other cosmic beings in the comics.
What's Lady Death's Role In 'The Infinity Gauntlet' Comics?
Comic book fans are looking for Lady Death because she was Thanos's motivation for destroying humanity. The Infinity War trailer highlights his goal to get all six Infinity Stones, but he already has them in the comics. The finger-snapping moment also happens in The Infinity Gauntlet story, but he did it to impress Lady Death by destroying half the galaxy.
Fans also expected the character due to a post-credits scene from The Avengers in 2012, which teased Lady Death's appearance. It mentioned Thanos "courting" death, possibly referring to the lovestruck Thanos trying to earn her approval in the comic version.
At that time, it's possible that there were plans to put her on screen. However, with Joss Whedon's departure from the series and the Russo brothers' arrival, plans might have changed, and Lady Death was scrapped. It's yet unknown if the character will never appear in future films, as more MCU titles are still in the pipeline.
Avengers: Infinity War hits the theaters on April 27. It stars Robert Downey Jr. as Iron Man, Chris Pratt as Star-Lord, Chris Hemsworth as Thor, Chris Evans as Captain America, Tom Holland as Spider-Man, Josh Brolin as Thanos, and other actors in the Marvel Cinematic Universe.