Some members might be in shock. For example, Happy, who is Natsu's closest friend, would be extremely sad and might even consider leaving the guild too. He has always been by Natsu's side, and the sudden expulsion would leave him feeling lost.
The younger members might be inspired. Romeo is a young and well - liked character. His departure could make the younger members think about their own paths and whether they should also seek new experiences outside the guild.
His relationship with Lucy would be greatly affected. She might be one of the first to try and clear his name or convince the guild to take him back. Their friendship would face a huge test as she has to balance her loyalty to the guild and her belief in Natsu.
With Lucy, it could bring them closer in a way. Lucy might feel sorry for Natsu and try to help him get back into the academy. This shared goal could strengthen their bond as friends. She could also offer her place for Natsu to stay while he figures things out.
There could be a void in the guild's social dynamic. Lucy is often involved in the guild's daily activities and socializing. Without her around, the guild might seem a bit quieter and less lively. The other members would have to adjust to her absence, and this could lead to some changes in the relationships within the guild.
The guild members' reactions would vary greatly. Happy, being Natsu's closest companion, would likely be excited about the fanfiction. He might fly around the guild hall, telling everyone about it and adding his own little comments about how accurate or inaccurate it is. He would definitely be protective of Natsu's image in the fanfiction, especially if it's not a positive portrayal.
Some of the more mischievous guild members like Gray might tease them a lot. He'd probably make jokes about it every chance he gets, much to Natsu and Lucy's annoyance. Happy, on the other hand, might be really confused at first but then start to see it as a sign of their closeness and be really happy for them.
The guild might see it as a call to action. They would come together to support Natsu in getting his power back. This could strengthen their bonds even more. Also, they might start to train harder to make up for the loss of Natsu's power.
At first, they might be in disbelief. The members of Fairy Tail see Natsu as a core part of the guild, so it would be hard for them to accept that he has betrayed them. They would probably try to talk to him and find out what's going on. Some members might be angry immediately, thinking that he has turned his back on their family. But others, like Lucy, might be more hesitant to believe it and would look for a way to resolve the situation without conflict.
The guild would likely be shocked at first. They consider Natsu as one of their own, so his attack would be completely unexpected. Some members might try to talk him down, like Lucy. She has a close bond with Natsu and would probably try to reason with him.
Emotionally, Natsu could become more empathetic. If he meets characters in the dark guild who had a difficult past that led them to the dark side, he might start to see things from their perspective. This doesn't mean he would support their actions, but he would understand them better. For example, if there's a character in the dark guild who was orphaned and turned to dark magic for survival, Natsu might feel sympathy for them and try to offer an alternative path rather than just attacking them. This would show a more mature and compassionate side of his character that wasn't as prominent before.