Sure, it can be normal. Just like any person might be interested in what others write about them or their alter - ego. It's a way to connect with the fan community on a different level.
Well, it could be a way for the daredevil to see how others perceive their character. Maybe they find it interesting to see the different scenarios and relationships that fans come up with in the fanfiction.
In Thor vs Iron Man fanfictions, a really interesting plot twist is when the two are forced to work together against a common enemy. They start off as rivals but then realize that they need each other's skills. Another popular twist is when there is some sort of time - travel or alternate dimension involved. Maybe Iron Man travels to a time when Thor was a young and inexperienced warrior, or Thor finds himself in a dimension where technology is far more advanced than in Asgard and he has to adapt quickly to face Iron Man. These plot twists keep the fanfiction fresh and exciting for readers.
Well, it really depends on how the fanfiction is written. If the story focuses on Iron Man's technological advancements and his ability to quickly analyze and counter Thor's attacks, he might have a chance. However, Thor's raw power is not to be underestimated. He has centuries of combat experience and his powers are magic - based, which could potentially bypass Iron Man's technological defenses. So, more often than not, Thor has the upper hand.