Aldrich Killian
Let’s throw it way back to Iron Man 3’s villain, Guy Pearce’s Aldrich Killian, a.k.a. the closest the universe had been able to get to the Mandarin. Killian was one of the weakest villains (thematically) in the MCU, and he died fair and square at the end of the movie by Pepper Potts’ hands. Moving forward, Aldrich Killian could maybe play a part in Shang-Chi and the Ten Rings, since the film is set to introduce the real Mandarin, to be played by Tony Leung. There could be a connection of some sort between the characters, because Aldrich assumed his title in Iron Man 3, but how about we don’t look back, and just keep Killian in that film.