Gojo's power of the Six Eyes could help him detect magic in ways the Fairy Tail wizards can't. For example, he could see the flow of magic energy in a battle and predict his opponents' moves better.
Deku's One For All power could be seen as a sort of super - strong magic in the Fairy Tail universe. It could be that he has to learn to control it in a different way, like using the Fairy Tail guild's training methods. Maybe he'd have to combine it with some form of Fairy Tail magic to make it even more powerful.
If Deku had a quirk in fanfiction, it would likely impact his character development. He might have become more powerful quicker or taken on different enemies. The story could become much more action-packed or focus on different themes.
It could make for a really exciting and unique story. Deku's growth and challenges would be measured in a more structured way, adding a new layer of excitement to his journey.
Toge Inumaki is important too. His special cursed speech ability makes him stand out. Also, the principal of the school, Masamichi Yaga, is likely to be important as he is in a position of authority and has an influence on Gojo and the other students. There could be other characters like the members of different clans that also play roles in the complex web of the story.
Since Deku can now access different percentages of 'One For All' power, he could share some of that power with Black Panther in a temporary boost. In return, Black Panther could use his knowledge of Wakandan technology to create some sort of device that helps Deku better control his power. This way, their powers would be combined in a more strategic and long - term way.
One great Gojo fanfic is 'Gojo's Ascent'. It delves deep into his character, exploring his powers in unique ways and his relationships with other characters. The story has a great plot that keeps you hooked from start to finish.