Well, in such a fanfiction, Naruto might struggle at first to control the Quake - Quake Fruit powers. Since his chakra control is different from how the fruit's powers are typically harnessed. But once he gets the hang of it, he could use it in creative ways. He might combine it with his shadow clone jutsu. The clones could all use the quake power simultaneously, creating a massive and widespread destruction on the battlefield, catching his enemies completely off - guard.
One idea could be that Naruto discovers the Quake - Quake Fruit in a mysterious land during one of his travels. He then has to learn to use it without the knowledge of his friends at first, because he's not sure if it's a good or bad power. This secrecy could create some interesting conflicts and misunderstandings within the Konoha village.
The power dynamics between characters would shift. Wizards and witches who were previously dominant in battles using magic spells would now have to contend with those who could use the Quake Quake Fruit's power. A character like Voldemort, who was feared for his dark magic, would now also have to worry about an opponent who could cause massive earthquakes to topple his strongholds. This would force him to either find a way to gain the power for himself or find a way to neutralize it in his enemies.
In such a fanfiction, perhaps Hermione could study the properties of the Quake Quake Fruit. She might try to find a way to replicate its power using magic, or she could figure out how to counteract its effects if an enemy were to possess it. This would involve her delving into both the magical knowledge of the Harry Potter universe and the unique abilities of the Quake Quake Fruit.
Imagine Luffy (since he has the Quake - Quake Fruit in this fanfiction idea) interacting with Gray from Fairy Tail. Luffy's carefree and bold nature against Gray's cool and sometimes brooding personality. Luffy could show off the power of the fruit, and Gray might try to freeze the seismic waves. It would be a clash of different powers and personalities. Also, Hinata from Naruto and Lucy from Fairy Tail could have a sweet interaction. Hinata could be shy around Lucy at first, but they could bond over their support for their respective teams.
In the comics, Quake isn't usually regarded as the face of Shield. Shield has several well-known characters who take on more significant and representative roles within the organization.