One way to explore their brotherhood in a fanfic is by delving into their backstories. Perhaps they were separated at birth due to some sort of conflict or plot. As they reunite, they have to come to terms with being brothers. Naruto could try to bring out the good in Deidara, who has been on the wrong side in the original series. Their bond could grow as they protect each other from threats, and they could even start to develop a new jutsu together that combines their unique abilities.
In a fanfic, their relationship could be explored through shared adventures. Maybe they discover they are brothers early on. They could learn from each other's skills, like Naruto's Rasengan and Deidara's explosive art. They might face challenges together against common enemies, like the Akatsuki or other powerful foes. Their different personalities would also play a big role. Naruto's optimism and determination could contrast with Deidara's more explosive and impulsive nature.
In a fanfiction where they are brothers, their relationship might start off rocky. Deidara is from Iwagakure and Naruto from Konohagakure. They could have grown up apart due to the political situation between the two villages. But when they discover they are brothers, they might struggle to come to terms with it. Naruto, being the more optimistic one, would probably be the first to reach out, while Deidara, with his more rebellious nature, would be hesitant. However, over time, they could form a strong bond based on their shared blood and mutual understanding of the shinobi world.
Well, their brotherly relationship could also be shown in how they deal with the village's problems together. Naruto's strong will and Minato's wisdom could combine. They might face off against a new, powerful enemy that threatens Konoha. Naruto would be all about charging in, while Minato would plan a more strategic approach, and they'd have to learn to work with each other's styles.
One idea could be that they discover they are brothers in a hidden past plot twist. Maybe their parents were from different villages but fell in love secretly. As brothers, they could team up to face a new and powerful enemy that neither could defeat alone.
In this fanfiction, their brotherhood might lead to a cultural exchange between Iwa and Konoha. Naruto could introduce Deidara to Ichiraku Ramen, and Deidara could show Naruto some unique Iwa traditions. As they do this, they also have to face some who oppose their new relationship, thinking it might be a threat to the balance of power between the villages. But they prove everyone wrong with their strong bond and how they use their combined skills to protect both villages.
One way to explore their relationship is through flashbacks. For example, showing their childhood together, how they were different even as kids. Batman might have been the more serious and rule - abiding one, while Joker was always the troublemaker. In the present of the fanfiction, Batman could be trying to rehabilitate Joker, believing that there is still some good in him because of their brotherly bond.
A possible plot could be that they are on a quest to find out the truth about their family. Along the way, they encounter various ninja clans who either help or hinder them. They might have to fight against those who don't want the truth to come out. Another plot could be that they are forced to team up against a powerful new enemy that threatens the entire ninja world. Their combined skills would be crucial in defeating this foe.
In a fanfiction about them as siblings, their powers could be an interesting aspect. Naruto has the Nine - Tails' power, while Tayuya has her music - based jutsu. They could train together and combine their powers in unique ways. For example, Naruto could use his chakra to enhance Tayuya's sound - based attacks, creating a powerful new form of combat that is exclusive to their sibling bond.
Naruto is very extroverted and determined, while Deidara is more of an artistic loner. In a fanfiction, their interactions could show how Naruto's cheerfulness and positive attitude might initially annoy Deidara, but also gradually draw him out of his shell. Deidara's cold and calculating nature could be a contrast to Naruto's impulsive behavior.
Their relationship might start with a lot of conflict. Naruto is a firm believer in protecting life and Deidara, even as a female, is known for her destructive art. But as they interact more, they could start to see the person behind the actions. For example, Naruto might notice that the female Deidara has a creative side that is just misdirected. And she could see Naruto's determination and start to respect him, which could lead to a slow - burning relationship.
In fanfiction, Naruto and Obito could have a very complex relationship as brothers. Obito, with his troubled past, could be both a source of protection and a cause for worry for Naruto. Naruto's positive nature might initially be at odds with Obito's more jaded view, but over time, Naruto could help Obito see the good in the world again.