There are some great ones. Some authors combine the unique abilities of the Gum Gum Fruit from One Piece into the Naruto universe in really creative ways. For example, they might have a character with the powers of the Gum Gum Fruit training at the Ninja Academy, which leads to all sorts of interesting scenarios and interactions with the original Naruto characters. You can also check out some of the reviews on the fanfiction platforms to find the most popular and well - written ones.
Common themes include the idea of an outsider. Since the Gum Gum Fruit is from a different universe, a character with its power can be seen as an outsider in the Naruto world. This can lead to themes of acceptance or discrimination. Also, adventure is a big theme. Using the Gum Gum Fruit powers to go on quests or explore new areas in the Naruto universe is quite popular in these fanfictions.
In the fanfiction, if Harry eats the Gum - Gum Fruit, it could completely change his personality. He might become more carefree and adventurous, similar to how Luffy is. His relationships with other characters would also shift. For example, his friends might be both amazed and a bit worried about his new powers. And he would probably have to learn how to control his stretching abilities, which could lead to some humorous situations as he accidentally stretches too far or gets stuck in a strange position.
In fanfiction, if Naruto ate the Gum - Gum Fruit, he would likely gain some really interesting abilities. He could stretch his limbs like Luffy from One Piece. This would give him a whole new fighting style. He might be able to stretch his Rasengan - holding hand to surprise his enemies from a long distance. Also, his acrobatic skills would be enhanced as he could use his stretched body parts to swing around like a slingshot.
His story changes drastically. He could be seen as an outcast at first because of his new strange powers. But as he learns to use them, he becomes a hero.
Naruto's character would become more versatile. With the Gum - Gum Fruit powers, he'd be less reliant on just his chakra - based techniques. This could make him more confident in different situations. He might start to see battles from a different perspective, one that combines his ninja skills with his new stretchy powers. His carefree nature could be enhanced as he has fun exploring his new abilities.
Another concept might be the creation of new spells or magical items inspired by the Gum Gum Fruit. Maybe a spell that gives an object the ability to stretch like the Gum Gum Fruit. This could be used in various situations, such as in a duel or to reach something in a dangerous place.
The Gum Gum Fruit can significantly change the power dynamics. Since it gives the user the ability to stretch and manipulate their body in strange ways, it can provide an advantage in combat. In a wizard duel, a character with the Gum Gum Fruit power could dodge spells more easily by stretching their body out of the way.
Cave Story is a complex game with many elements. The 'gum base' might be a very specific and perhaps even a somewhat hidden or less - known aspect. It could be part of a side - quest, or it could be something that is only relevant in certain levels or areas of the game. If it's an item, it might have a special function like being used to unlock a secret passage or to enhance a character's abilities in a particular way.
There are also horror stories about the appearance after the gum graft. Sometimes the grafted area might not look natural at all. It could be too thick or have an odd shape, which can be really distressing for the patient. In one story, a person's gum looked like it had a big lump after the graft, and it took a long time to even out a bit.