Tony would probably be extremely hurt. He trusted his team, and betrayal would cut deep. He might initially be in denial, not wanting to believe that his friends could turn on him.
Yes, there are quite a few. Some explore the impact of his death on the other Avengers, like how they deal with the loss and the changes it brings to the team dynamics.
He would probably be overprotective at first. Tony has been through a lot, and the idea of his daughter having mutant powers, which could make her a target, would be scary for him. He might try to keep her locked away in the Stark Tower, but that would likely lead to her rebelling.
The Avengers would be in a state of panic and fury. Captain America would likely lead the charge to find Tony. He'd use his military strategy skills to plan a rescue mission. Thor might use his godly powers to track down any signs of Tony's whereabouts. Black Widow and Hawkeye would be on the lookout for any Hydra agents or informants. Hulk could be a wildcard. He might be uncontrollably angry and ready to smash anything in his path to get to Tony.
He'd probably be shocked at first. Tony is always so caught up in his own world that a secret daughter would be a huge surprise. But then he'd likely be protective. He might try to keep her away from his dangerous life at first, but as he gets to know her, he'd start to include her in things.
One common theme is mortality. Since Tony Stark is a mortal human and Lady Death represents the end of life, many fanfictions explore his struggle with his own mortality in the face of this powerful entity.
There's 'The Bargain with Death'. It's a fanfiction where Tony Stark makes a deal with Lady Death. The story is full of suspense as it shows how Tony's life changes after this fateful bargain. It also gives an interesting take on Lady Death's character, showing her as not just a force of destruction but also having some form of complex personality.
Common themes are sacrifice and redemption. Tony may have to sacrifice parts of his life or relationships to deal with Death's love. Redemption can also come into play, as perhaps he views his near - death experiences as a chance to make amends for past mistakes. Additionally, the theme of the unknown is present. The nature of Death's love is something Tony has to figure out, and it represents the unknown aspects of the afterlife and the supernatural that are usually not part of his scientific - minded world.
Yes, there are quite a few. Some might explore the concept of Death having an unusual attraction to Tony Stark in a very dark and complex way, often delving into themes of sacrifice and the afterlife.