Perhaps the idea of how the bloodline interacts with existing Naruto elements. It might be that the portal bloodline can be combined with chakra natures, like a character using their portal - creating bloodline along with fire chakra to launch attacks through portals. This would add a whole new level of combat strategy to the story.
One interesting concept could be unique bloodline abilities that are created specifically for the fanfic. For example, a bloodline that allows the user to open portals to different dimensions within the Naruto universe.
One interesting concept could be unique bloodline abilities that are different from the original Naruto series. Maybe new forms of elemental control or physical enhancements.
One interesting concept could be the unique abilities that come with the crystal bloodline. For example, the ability to create crystal structures for defense or attack. Maybe the characters with this bloodline can crystallize parts of their body for added protection in battle.
One interesting concept could be the unique jutsu combinations that can be created with two different bloodlines. For example, if a character has both the Uchiha and Senju bloodlines, they might be able to use a super - powerful fire - based jutsu with enhanced healing abilities at the same time.
Some interesting concepts in such a fanfic might include the inheritance of fuuinjutsu through bloodlines in unexpected ways. For instance, a character who is not from a well - known sealing - focused bloodline might suddenly discover they have an aptitude for fuuinjutsu due to a hidden connection in their family's past. Additionally, the concept of bloodline - based fuuinjutsu being used to unlock ancient secrets or powers can make for a really engaging story.
One interesting concept could be the unique abilities that come with the wolf bloodline in the Naruto universe. For example, enhanced speed and agility similar to that of wolves in the real world. Another could be a special connection to nature, perhaps being able to communicate with wolf - like summons more effectively.
Well, in such a fanfic, the origin of the mind control bloodline can be a really fascinating aspect. It could be an ancient power that was lost and rediscovered. This could lead to a whole story arc about the search for the knowledge to master this power. And perhaps it has some connection to an old clan that was once feared for their mind - controlling abilities.
In Naruto fanfiction, the Sharingan is often explored in unique ways. For example, some fanfictions might expand on its ability to not only copy jutsu but also to predict an opponent's moves on a whole new level. Another interesting bloodline concept could be the Uzumaki's massive chakra reserves, and fanfictions may play with how this could be used in different scenarios, like creating entirely new jutsu.
One interesting concept could be the exploration of new and unique bloodline abilities that are not in the original Naruto series. For example, a fanfiction might introduce a bloodline that allows the user to control time on a small scale. Another concept could be the combination of different existing bloodlines to create a hybrid with extraordinary powers. Some fanfictions also delve into the origin and history of the known bloodlines, providing a deeper backstory that was not fully explored in the original.
There are also fanfictions where a bloodline is created through some sort of experimental jutsu. For example, a bloodline that allows the user to transform into different elements at will. This would give the character an edge in combat as they could adapt to any situation by changing their form.
One interesting concept is that the Chakra Chains could be a sign of a long - lost or extremely rare bloodline. In fanfic, it could be a bloodline that was thought to be extinct but resurfaces in an unexpected character. Another concept could be that the Chakra Chains' power varies greatly depending on the purity of the bloodline. So a character with a more diluted bloodline might have weaker chains compared to a pure - blooded descendant.