How would characters react when they watch Overlord fanfic?

They could be surprised. The fanfiction might show them in scenarios they never imagined, like a shy character being in a very bold and adventurous situation.

Some characters might be amused. They could find the different interpretations in the fanfiction entertaining and might even share it with other characters.

Naruto would likely be very curious and excited. He'd probably try to befriend everyone, whether they were humans, demi - humans or monsters. His positive attitude would be a shock to some of the more cynical characters in the Overlord world. Sasuke, on the other hand, would be more guarded. He'd assess the situation and look for ways to gain power. He might see the powerful magic and different races as a means to achieve his own goals.

Well, they might get really surprised by the different interpretations of the original story. For example, if a fanfic gives a new backstory to a minor character, the characters in the original might be shocked to see how they are perceived in this new version.

The Death Eaters and their sympathizers would be terrified. Harry, as the overlord, would be a major threat to their ideology. Voldemort, if he somehow still existed in this fanfiction, would be in direct opposition to Harry. However, some of the more neutral characters, like Luna, would probably see Harry's new role as an opportunity for positive change in the wizarding world and would be happy to support him in his endeavors.

Some members like Itachi might be very calm and just observe quietly. He would probably analyze the stories, thinking about how the characters are developed and what the underlying themes are.

Usopp might be inspired to be braver. When he watches Luffy's memories, he could see how Luffy fearlessly faces powerful enemies. This would make Usopp want to overcome his own cowardice and be more like Luffy. And Robin, she would gain more insights into Luffy's kind heart. She might see how Luffy has always been inclusive and accepting of everyone, which would make her feel even more at home in the crew.

Well, there are also those characters who might be a bit shocked or confused. Take Levi from Attack on Titan. He's a very serious and no - nonsense type of character. If he were to read some of the fanfic about him that deviated too much from his own self - perception, like being made into a comical or overly emotional character in the fanfic, he might be taken aback at first. But then he might also realize it's just a different interpretation and not take it too seriously.

Characters might also be a bit critical. They know their world and themselves better than the fanfiction writers. So they could be nitpicking at inaccuracies or things that don't quite fit with their personalities. But at the same time, they may also be impressed by the creativity and passion that goes into creating these fanfictions.

There could be characters who are outraged. If the fanfiction distorts their personality or makes them do things completely against their nature, they may be very angry. For example, a noble character made to act like a coward in the fanfiction would likely not take it well.