Well, it could be that in this fanfic, Naruto has developed a new jutsu that allows him to analyze and then replicate the DNA - like aspects of bloodlines. He might be using his vast chakra reserves to fuel this ability. For example, if he encounters a bloodline with a special element - like the Ice Release of the Yuki clan - he could break down the chakra signature and recreate it within himself.
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.
It could be Orochimaru. Since he's always interested in kekkei genkai and bloodlines, he might oppose Naruto when he discovers Naruto's new ability to copy bloodlines. Orochimaru would see Naruto as a threat to his own plans of collecting and using powerful bloodlines.
One possible fanfic could be about a world where Naruto's chakra bloodline and Spiderman's radioactive - spider - bitten bloodline somehow get combined. Maybe a scientist in a multiverse experiment goes wrong and mixes the genetic elements of the two. This could lead to a new hero or anti - hero with the agility and web - slinging ability of Spiderman and the chakra - based powers like ninjutsu from Naruto.
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, 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.
Well, it could change the power balance significantly. If Naruto can absorb bloodlines, he might gain new and unique abilities. For example, he could absorb the Sharingan's power, which would give him enhanced visual abilities and maybe even some of the Uchiha clan's signature jutsu. This would make him an even more formidable opponent and could change the way battles play out. It might also create new rivalries or alliances as other characters react to his newfound 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.
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.
Well, it completely flips the power dynamics. With all the bloodlines, Naruto becomes an overpowered force. Enemies who were once a threat are now easily dealt with. His new abilities can make battles much shorter as he can combine different bloodline techniques in unexpected ways. For example, using Sharingan's precognition with Byakugan's long - range vision to dodge attacks and counterattack simultaneously.
Often, it's through creative combinations. Writers might think about what would happen if two powerful clans had a genetic cross. For instance, mixing the abilities of the Inuzuka and Aburame clans could lead to a bloodline with insect - controlling skills and enhanced senses like a dog's.