In some fanfics, the twin brother could have a special connection to the Nine - Tailed Fox that is different from Naruto's. He might be able to communicate with the fox in a more peaceful way or have some hidden power related to the fox that was dormant until a certain event. This would change the power dynamics and the story's progression.
Maybe the twin brother was separated at birth and raised in a different village. This would create a situation where they are on opposite sides in a conflict initially. But as they discover their relation, they have to figure out how to reconcile their loyalty to their respective villages with their new - found family bond.
One interesting plot could be the twin brother having a different chakra nature which leads to unique jutsu development. For example, if Naruto has wind chakra mainly, his twin might have lightning chakra and develop some cool lightning - based jutsus that help them in battles together or in different ways.
Maybe the twin brother was separated from Naruto at birth and raised in a different village. When they finally meet, they initially clash due to their different upbringings and loyalties, but then gradually come to understand and support each other. This would create a lot of drama and character development.
One factor that makes it interesting is the potential for new storylines. For instance, the twin brother could have a different chakra nature or a special ability that Naruto doesn't have. This can lead to all sorts of adventures and conflicts. Also, exploring the relationship between the two brothers, whether it's a friendly rivalry or a more complex emotional bond, can be really engaging for readers.
As the story progresses, they could start to realize that they are stronger together. They might face a common enemy that forces them to work as a team. Through shared experiences like training together and fighting side by side, their relationship turns into a strong bond of brotherhood.
One interesting plotline could be how the twin sister affects Naruto's journey. Maybe she has a different view on the ninja world and helps Naruto see things from a new perspective. For example, she might be more in tune with the spiritual side of being a ninja and teach Naruto about ancient jutsu that he otherwise wouldn't have known.
One interesting plot could be that Naruto discovers his hidden bloodline gives him the ability to control time in small increments. This allows him to dodge attacks more easily and plan his counter - attacks more effectively.
Well, a cool plotline could be that the twin brother has a relationship with a character that Harry doesn't really interact with much in the original series. Say, he becomes friends with a Slytherin who has a different view on the wizarding world. This friendship could bridge the gap between the houses in a way that Harry's relationships in the original story don't. It could also lead to the twin brother having a different perspective on the ongoing conflict between good and evil in the wizarding world.
One interesting plot could be Naruto gradually learning to control the power of the god sealed within him. Maybe he discovers new jutsus or abilities that are unique to the god's power. For example, he might be able to manipulate time or space in a way that no other ninja can.
Another plot could be that Merlin's brother is initially on the wrong side. Maybe he's been influenced by Morgana or some other dark force. But through Merlin's love and persuasion, he eventually sees the error of his ways and joins Merlin in the fight for good.
The twin brother's character might be developed based on his past. If he had a difficult childhood, it could make him more reserved or cautious. But as he gets to know Naruto and Sakura, he starts to open up. He could start as a loner type, but as he gets involved in their adventures, he becomes more social and confident. He might also develop his character by exploring his own unique abilities and how they can be used for good.
One interesting plot could be two Narutos from different timelines meeting. They could exchange stories about their battles and growth, and then team up to face a new, powerful enemy that neither could defeat alone.