The guild as a whole would likely mobilize. Erza would start formulating a strategic plan. She'd consider the strengths and weaknesses of Acnologia and figure out the best way to approach the situation. Gray would also be ready to fight, using his ice - make magic to support the rescue mission. They would all be united in their determination to get Lucy back safely.
The Fairy Tail guild would probably be very curious about Naruto at first. They might be amazed by his strange abilities like running up walls and creating clones. Some members, like Lucy, would likely be a bit cautious, but also intrigued. Natsu would probably be eager to test his strength against Naruto right away.
In color - themed Fairy Tail fanfiction, you can develop characters by giving them unique color - related goals. A character with purple - themed magic might be on a quest to find all the different shades of purple in the magical world to unlock a powerful spell. This goal would drive their actions and decisions, and as they face obstacles, they would grow and change. Their relationships with other characters would also be influenced by this goal, as some might help while others might oppose them.
One idea could be to focus on a new character in the Fairy Tail world with a unique color - related magic. For example, a character who can manipulate colors to create illusions or even use them as a form of defense. They could join the Fairy Tail guild and have all sorts of adventures with the existing members.
Sakura could fit in as a healer. In Fairy Tail, having a powerful healer is always valuable. Her medical ninjutsu skills would be highly regarded, and she could quickly become an important member of the guild when it comes to treating injuries after battles.
It could lead to a change in the guild's dynamics. Naruto has his own unique combat style and abilities. His departure might make the guild realize the need to diversify their fighting strategies. For example, they might start to look for members with skills similar to Naruto's ninja techniques.
She would fit in very well. The Fairy Tail guild is all about family and acceptance. Given her parents are Lucy and Natsu, she'd be welcomed with open arms. She could learn from the older members like Makarov and Mirajane, and bond with the younger ones like Romeo. Her magic skills would also contribute to the guild's strength during battles or when helping the town.
If Sasuke joined a Fairy Tail guild in fanfiction, there would be a lot of drama. The other guild members would be initially suspicious of him because of his cold and brooding nature. But his skills would quickly earn him respect. He might have a hard time adjusting to the guild's more laid - back and friendly atmosphere compared to the ninja world. However, his determination to become stronger would fit right in with Fairy Tail's spirit.
He could leave because of a misunderstanding. Maybe he overhears something wrong and thinks the guild doesn't trust him or value him anymore. So in a fit of anger and pride, he decides to leave.
One possible fanfiction could be about a character from Naruto being transported to the Fairy Tail universe and getting involved with a Dark Guild. Maybe Naruto's skills in combat and his never - give - up attitude would help him either infiltrate the Dark Guild to gather information for Fairy Tail or try to reform some of the members.