In some fanfictions, one could be the Sharingan, which gives abilities like seeing chakra and predicting moves. Another might be the Byakugan, with its great vision powers. And the third could be something unique like the Ketsuryugan, which could have powers related to blood manipulation.
In the 'naruto has 3 bloodlines' fanfiction, these bloodlines can have a profound impact on the story. For instance, if one of the bloodlines allows Naruto to communicate with animals in a special way, it could lead to new alliances and ways of gathering information. A bloodline that enhances his ninjutsu in a unique way might make him the target of other villages or rogue ninjas who want to steal his power. And a bloodline that gives him the ability to heal others more effectively could change his role within the village from just a fighter to also a healer, which would completely shift the relationships he has with other characters and the overall direction of the story.
In some fanfictions, Naruto might be given the Uchiha bloodline, which could potentially grant him the Sharingan. Another common one is the Senju bloodline, as it was very powerful and associated with Hashirama Senju. Some might also give him the Hyuga bloodline for the Byakugan.
The six bloodlines in the 'naruto has 6 bloodlines fanfiction' could be really diverse. It might start with the Senju bloodline which is known for its great chakra reserves and strong life force. Then there could be a bloodline related to some sort of space - time manipulation, like a new version of the Kamui ability. There might also be a bloodline that gives the user the ability to communicate with animals in a more profound way, similar to but different from the Inuzuka clan's bond with dogs. Since it's a fanfiction, the author has a lot of creative freedom to come up with these bloodlines.
The new combinations of abilities from the six bloodlines make it interesting. It allows for unique character development and power - ups that we don't see in the original Naruto story.
One interesting combination could be the Uchiha bloodline with the Uzumaki bloodline. The Sharingan from the Uchiha and the massive chakra reserves and sealing abilities of the Uzumaki could create a really powerful Naruto. Another could be the Hyuga bloodline combined with the Uzumaki. The Byakugan's visual prowess along with the Uzumaki's chakra would give Naruto enhanced perception and more chakra to use for powerful jutsu.
Maybe he uses some kind of special jutsu. It could be a new form of his shadow clone jutsu where the clones are able to analyze and then copy the bloodline traits of the opponents they encounter.
One interesting ability would be combining the Uchiha's fire - based jutsu from the Sharingan with the Uzumaki's chakra - enhancing abilities. This could create some really powerful and unique fire - type attacks. And with the Hyuga's Byakugan, he could precisely target weak points in an opponent's chakra system while using his own powerful chakra punches. He might also be able to use the Nara's shadow - binding techniques in a more enhanced way with his newfound power boost.
Well, if Naruto has three bloodlines in fanfiction, it could greatly enhance his abilities from the start. For example, one bloodline might give him enhanced physical strength, another could provide unique ninjutsu capabilities, and the third might offer some sort of special perception. This would likely make him more confident earlier on as he wouldn't have to struggle as much with basic power levels. It could also lead to him being more isolated as others might fear or envy his multiple powers.
Well, it changes a great deal. With all bloodlines, Naruto becomes an extremely powerful force. He can combine the unique abilities of different clans. For example, he could use the Sharingan's predictive abilities along with his own Uzumaki stamina and chakra reserves. This would make him almost unbeatable in combat against most foes. Enemies who were previously a threat would find it much harder to face him as he could counter their techniques with a wide variety of bloodline - based powers.