Well, one possible plot could be that Goku somehow ends up in the Fairy Tail world. He might initially be confused by the magic there, but then start to learn about it. He could team up with Natsu and the gang to fight against a powerful dark wizard. Goku's strength and his unique fighting skills like the Kamehameha could be a great asset to Fairy Tail in battles.
One possible plot could be that Goku somehow gets transported to the Fairy Tail world. He might initially be confused but quickly adapt due to his adventurous nature. He could team up with Natsu and the others to fight a common enemy, like a powerful dark guild that has a magic that can rival Goku's strength. Their combined powers would make for an epic showdown.
One possible plot could be that Goku somehow gets transported to the Fairy Tail world. He could join forces with Natsu and the gang to fight against a common enemy like Acnologia. Goku's power levels would be off the charts compared to most in Fairy Tail, but he'd be intrigued by their magic. Maybe he'd learn some magic himself or teach them some of his ki techniques.
Imagine Goku meeting Lucy. Lucy, being a celestial spirit mage, would be fascinated by Goku's power. Goku, on the other hand, might not understand the concept of celestial spirits at first. But as they interact more, Goku could help Lucy become stronger physically, while Lucy could introduce Goku to the magical side of the Fairy Tail world. Goku could also have interactions with Gray. Gray's ice - make magic would be a contrast to Goku's heat - based ki attacks. They could have friendly battles to test each other's strength.
It could be about Natsu having left Fairy Tail for some reason and then reuniting with the guild in a very unexpected way. Maybe he has new powers or a different outlook on life that causes some friction and also some amazing moments of reunion and growth within the guild.
Erza would also be a good pairing. She is a very disciplined and strong - willed character. Goku could learn from her discipline, and she could learn from Goku's carefree yet determined attitude. They could fight side by side in battles and protect each other.
If DBZ Goku were in Fairy Tail, his sense of justice would fit right in. He could form strong bonds with the Fairy Tail members. His training regime might even influence some of the wizards to train harder. And when it comes to battles, his ability to sense energy would give him an edge over many foes. He could also learn some of the Fairy Tail magic techniques and combine them with his own powers in really interesting ways.
Well, one unique aspect is his power level compared to the Fairy Tail characters. Goku Black is extremely powerful, so in fanfictions, he can either completely overpower the Fairy Tail mages or he might teach them new ways to increase their strength. For example, his ki - based attacks are a completely different form of energy than the magic in Fairy Tail.
There could be a fanfiction where Goku is a long - lost relative of a powerful Fairy Tail wizard. In this story, he discovers his family ties while also having to face off against a common enemy that threatens both his Saiyan heritage and the Fairy Tail guild. He would bring his Saiyan strength and tenacity to the battles in the Fairy Tail world.
Well, Goku's powers are extremely powerful. In Fairy Tail, magic is the main power source. Goku's ki-based abilities could be seen as a super-advanced form of magic. His super strength, speed, and energy blasts could make him a formidable ally or a terrifying foe. He could easily take on some of the stronger dark guilds by himself. Also, his ability to constantly grow stronger through training would be a unique aspect compared to the mages in Fairy Tail who mainly rely on learning new spells.
The plot could involve Kagome bringing her spiritual powers and archery skills to Fairy Tail. Maybe she'd form a team with some of the guild's mages and go on adventures. She could use her holy powers to combat dark magic threats in the Fairy Tail world.