I think Lucy could be very important. Since she is smart and often has a different perspective, she might be the one to analyze the future visions properly and come up with a plan. Also, her celestial spirit magic could play a crucial role in dealing with future threats that are related to the spirit world.
Natsu could be the most important. His impulsive nature might lead to him either taking quick action to change the future or causing some unforeseen problems while trying to deal with it.
It could also be about the Fairy Tail guild making decisions based on the future they see. They might change their current actions to avoid a bad future or strive to achieve a better one. They could start forming alliances with other guilds earlier than they would have otherwise, in order to face a common future enemy more effectively.
Lucy might also be very affected. She had finally found a place where she belonged in Fairy Tail. Without the guild, she could face financial difficulties as she relied on the guild for jobs. Also, she would miss the emotional support and friendship she had there.
Definitely Gray. Their personalities are quite different. Gray is cool - headed and uses ice magic, while Wolverine is more of a rough - and - tumble fighter. The contrast in their powers and attitudes would lead to some great banter and interesting team - up moments.
Another character who could run a burger joint is Macao. He seems like the type who would enjoy the hustle and bustle of running a business. He has a lot of experience in the guild and is good at dealing with people. He could use his fire magic to cook the burgers in a unique and fast way, adding a special touch to the food at his burger joint.
Natsu would probably be the most entertaining. His fiery and impulsive nature would lead to all sorts of comical situations at the beach. He might try to swim in lava - like hot water or accidentally burn someone's beach towel while trying to dry himself off.
But we also can't forget about Ichigo in his final form. He has the power of a Soul King and his combat skills are top - notch. If he were to enter the Fairy Tail world with all his power, he would be able to take on most threats with ease. It really depends on how the crossover is written and what kind of challenges are presented to each character.
It could be Makarov. His experience and extremely powerful magic could give him an edge. He has seen many battles and his Fairy Law is a very strong spell. In a situation like an Infinity War, his leadership and power would be crucial for the Fairy Tail guild.
Yugi and Natsu would be an interesting pairing. Yugi is calm and strategic, while Natsu is impulsive and powerful. They could balance each other out. Yugi could use his intelligence to plan their adventures, while Natsu could use his fire - based magic to fight off enemies. Another interesting pair could be Erza and Kaiba. Erza is a strong and disciplined warrior, and Kaiba is a proud and powerful Duelist. They could have some epic battles of wills and skills.
Erza and Captain America would be an amazing combination. Erza is a strong and disciplined warrior in Fairy Tail, and Captain America is the symbol of justice and leadership in the Avengers. Erza's various armors and combat skills combined with Captain America's shield and strategic thinking would make them a formidable team. They could lead the combined forces of Fairy Tail and the Avengers in battles against powerful foes, and also inspire the other characters with their unwavering determination.
It's really hard to say. On one hand, you have characters like Gildarts in Fairy Tail who can destroy mountains with his magic. But then in Naruto, there are characters like Kaguya who has god - like powers. If we consider the ability to adapt, Naruto himself could be very powerful in a Fairy Tail - Naruto crossover. His ability to quickly learn new techniques and his never - give - up attitude would make him a formidable force. He could potentially learn some basic magic in no time and combine it with his ninja skills.