Warning: contains spoilers for Dark Ages #2!
The Marvel Cinematic Universe is influencing Iron Man in the comics in a radical way - and Avengers: Endgame is responsible for the biggest and most influential changes yet. The climatic film in the MCU ended the eleven-year story arc that began in 2008's Iron Man film; the story about a self-absorbed genius billionaire playboy philanthropist who ended up sacrificing his life to save the universe is loved by fans. But during the 2019 film, a key scene has apparently informed Tony's characterization going forward in the comics.
In the new 2021 series Dark Ages, written by Tom Taylor with art by Iban Coello and colors by Brian Reber, a living machine called the Unmaker threatens to destroy the Earth from the inside, having been buried beneath the planet millions of years ago. A team of superheroes sent to defeat the threat is all but decimated by the Unmaker, and only Doctor Strange survives to open a portal to a world where electricity cannot function. Though the Unmaker is destroyed, Doctor Strange dies in the battle and all electrical devices cease to function - meaning all of Tony Stark's inventions (including every Iron Man armor) become large paperweights practically overnight.
Yet in Dark Ages #2, Tony doesn't appear despondent in the slightest - and is, in fact, notably happier. After a semblance of order has been restored to the world and superheroes keep communications between settlements open via powerful telepathic X-Men, Captain America visits him (in his current base of operations - a cave, calling back to the first Iron Man film), and admits "I didn't expect to see you so...content." Pepper Potts, living with Tony in the cave, answers that a less exciting life is perfect for both of them.
This perfectly mirrors a scene in Avengers: Endgame in which Captain America meets Tony at his cabin in the woods. Five years after Thanos used the Infinity Stones to kill half the population of the universe, Tony has found peace living with Pepper and his daughter, Morgan Stark. When the comics once influenced the films, now the films influence the comics. The MCU's take on Tony in Endgame has even influenced the current Iron Man series by writer Christopher Cantwell; Iron Man was stranded on a planet without many resources and rather than try to find a way off, sought to help the small community. It didn't last, but it points to how Tony Stark would benefit from a simpler life.
Since Iron Man is one of Marvel's most popular heroes at the moment (a far cry from his unpopular status in the 90s), it's unlikely that the character will stay away from tinkering with technology for long. But placing Tony Stark in a cave - this time willingly - is an excellent way to communicate to the reader that he has grown up from his freewheeling years. Avengers: Endgame has influenced what Iron Man truly seeks out of life, after a long time fighting and protecting: peace.