The gardener could be Naruto's new friend. They bond over their love for plants. Naruto helps the gardener protect the garden from vandals or pests, and in return, the gardener teaches Naruto patience and the value of hard work, which strengthens their friendship.
In a fanfiction where Naruto is blind, his friends could encourage him to keep his spirit up. For example, Sasuke could come back and train with him in a way that suits his new condition. This would show that friendship endures through difficult times and that friends can help each other grow in new ways. They might also share their own insecurities with Naruto, creating a deeper bond based on mutual understanding.
The friends in RWBY could gather around to watch the raining rose petals together. They could share their memories and stories while the petals fall. It could be a moment of bonding for them, strengthening their friendship.
Overcoming differences is also a major theme. Naruto has friends from all kinds of backgrounds and with different personalities. In fanfiction, this often means exploring how they overcome their differences to form strong bonds. It could be a shinobi from a noble clan befriending a commoner shinobi, or someone from a rival village becoming a close friend.
One way is to use the character abilities from the game. For example, if there's a special jutsu in the Naruto game, you can have your fanfic characters use it in unique situations. Another way is to borrow the game's leveling system. Maybe your fanfic character starts at a low level and has to train to gain new powers like in the game.
You could create a character who is a rival pyromancer to Naruto. This character could have different techniques and a different moral code when it comes to using fire powers.
You could create a character who is an expert in nanite technology. Maybe they come from a far - off land where they've been studying nanites for years. They arrive in the Naruto world to study how the chakra system might interact with the nanites.
Another way is through the concept of power. Barbie has a certain power in her world of fashion and influence. Oppenheimer had the power of scientific discovery. A fanfiction could explore how these two different types of power interact. Maybe Barbie uses her influence to promote Oppenheimer's more ethical scientific ideas, or they clash when Barbie's commercial world and Oppenheimer's academic - military world collide.
Well, you can include the different jutsus. For instance, Naruto could combine his Rasengan with the power of the devil gene to create a new and more powerful attack. The chakra system can also be involved. Maybe the devil gene affects how Naruto's chakra flows, making it more unpredictable and dangerous.
Well, redemption is a major theme. Sasuke, who has made some wrong choices in the original story, often has a journey of redemption within these fanfictions in relation to his friendship with Naruto. Also, the theme of mutual understanding is very common. They have to understand each other's motives, dreams, and fears in order to have a strong friendship. In many fanfictions, they gradually learn about these aspects of each other.
In a Naruto Kaido fanfiction, to incorporate their different power systems, you could have Naruto's chakra - based jutsu interact with Kaido's Devil Fruit powers. For example, Naruto's Fire Style: Great Fireball Technique could be used against Kaido's ability to transform into a dragon. The heat from the fireball might have different effects on Kaido's dragon form compared to how it affects normal opponents in the Naruto world.