In the Marvel Cinematic Universe (MCU), after the character Tony Stark, played by Robert Downey Jr., sacrifices himself in “Avengers: Endgame” (2019), no one officially takes up the mantle of Iron Man. Tony Stark’s death marks the end of his character arc and his tenure as Iron Man in the MCU.
However, it’s important to note that in the comics, multiple characters have taken on the role of Iron Man at different times. Some notable characters who have assumed the identity of Iron Man in the comics include James Rhodes (War Machine), Pepper Potts (Rescue), Riri Williams (Ironheart), and Victor Von Doom (Doctor Doom). However, the MCU may deviate from the comic book storylines, and as of my knowledge cutoff in September 2021, there hasn’t been any official announcement regarding a new character taking on the role of Iron Man in the MCU.
It’s worth mentioning that the MCU is an ongoing franchise, and future developments, such as new characters or storylines, may introduce successors or characters who carry on the legacy of Iron Man in different ways. For the most accurate and up-to-date information, it is recommended to follow the official MCU releases and announcements.
