Well, he might gain some really cool and spooky powers. Maybe he could have the ability to manipulate souls like the Shinigami does. This could give him an edge in battles, being able to directly attack an opponent's soul or use soul - based defenses.
It could be a powerful jutsu. Since Shinigami is often associated with death and the afterlife in the Naruto universe, the gift might be a jutsu related to death or soul manipulation.
Well, if Naruto were to obtain a bloodline from Kami in a fanfic, it would be a huge game - changer. His physical and mental capabilities could skyrocket. He could have new jutsu that are on a whole different level, perhaps being able to heal at an accelerated rate or even have some sort of spiritual connection that allows him to foresee events. It would also likely cause a stir among the other ninja, who would either be in awe or fear of his newfound powers.
In some fanfictions, Naruto might obtain the Kyuubi's bloodline through a special ritual. This could be a ceremony performed by a powerful shinobi or a sage who has the knowledge to transfer the essence of the Kyuubi's power into Naruto's genetic makeup, thus giving him the bloodline.
In some fanfictions, Naruto might obtain the bloodline through a magical or spiritual connection with the Fem Kyuubi. Maybe during a moment of extreme danger or a special ritual where the power of the Fem Kyuubi is transferred to him, allowing him to gain a new bloodline.
It could be a sword. In many fanfictions, swords are common powerful weapons. Since the Shinigami is often associated with death and power, a sword with special abilities like being able to cut through spiritual barriers or absorb chakra could be a likely weapon for Naruto to obtain.
He could get a Dojutsu that allows him to manipulate time. This would be a very powerful ability as he could slow down or speed up time during battles. For instance, he could slow down time to dodge an enemy's attack and then speed it up to counterattack.
Well, it could make him an even more powerful ninja. The Dojutsu might give him new abilities like enhanced perception, the ability to see chakra more clearly, or even some kind of special attack. For example, if it's a Dojutsu similar to the Sharingan, he could potentially copy jutsu more easily.
In the fanfiction, Naruto could gain the power of enhanced perception. The Kyuubi's bloodline might give him the ability to sense things from a much greater distance, whether it's the presence of other ninja, hidden traps, or even changes in the environment. Additionally, he might have better control over his own emotions and be able to resist mind - control techniques more effectively. This is because the Kyuubi's bloodline could strengthen his mental fortitude, making it harder for enemies to manipulate his thoughts or feelings.
One potential power could be the ability to manipulate fire in a unique way. The Kyuubi has a lot of raw power and in a fem form, it might manifest as a different type of elemental control. Naruto could use this newfound power to create more powerful fire - based jutsus or even combine it with his existing techniques in a more effective manner. Another power might be enhanced speed. The Fem Kyuubi's bloodline could give Naruto the ability to move at blinding speeds, making him a more formidable opponent in combat.