Well, it implies that Naruto would have a huge burden and responsibility. Since each bijuu has its own personality and power, Naruto would need to balance and manage them all. He might face internal struggles as the bijuu's wills could conflict. In terms of the story, it would open up a world of possibilities for him to explore new forms of jutsu and power-ups. Maybe he could use the combined strength of all the bijuu to protect the entire ninja world from threats that were previously unbeatable.
In fanfiction, if Naruto is a jinchuuriki of multiple bijuu, it could mean extreme power levels. He might be able to access a wider range of abilities from different bijuu. For example, he could combine the fire - based attacks of one bijuu with the water - based defenses of another. This would make him an almost unbeatable force in battle scenarios.
His status as the jinchuuriki of all bijuu would change the political landscape of the Naruto universe. Konoha would become the most dominant village. Other villages might seek to either ally with Konoha or try to find ways to counter Naruto's power. It could also lead to a new era of peace as no one would dare to start a war against a being with such overwhelming power. However, there could also be those who would try to take advantage of Naruto's power for their own evil purposes.
It could be an ancient sage. In Naruto lore, there are sages who have had a great influence on the world. An ancient sage could be the one who created or fathered the bijuu. Maybe he had some great power and knowledge that allowed him to bring the bijuu into existence.
In this fanfiction, Naruto Jinchuuriki might have god - like powers such as extreme strength. They could potentially have the ability to control nature on a large scale, like summoning massive storms or earthquakes. Their physical endurance might be enhanced to the point where they can withstand attacks that would normally be fatal.
One of the popular ones is probably Kushina, Naruto's mother. Since she was a jinchuuriki herself, she often appears in these fanfictions in the harem. Another could be Fu from Takigakure.
The other Jinchuurikis could be potential allies. They understand the struggles and the power that comes with having a tailed beast inside them. For example, Killer Bee, who has a good relationship with his tailed beast, could share his insights on how to better co - exist with Shukaku. Tsunade might also be an ally, as she is a powerful Hokage who could offer protection and resources to the Jinchuuriki.
In 'fem bijuu are possessive of naruto fanfiction', Kurama is likely to be a very prominent fem bijuu. Given her power and the fact that she has been inside Naruto for a long time, her possessiveness can really shape the story. Additionally, Matatabi, the Two - Tailed Cat, could also be a notable fem bijuu. Her feline nature might add an interesting layer to her possessiveness towards Naruto, perhaps making her more sly and protective in a different way compared to Kurama.
In many Naruto fanfictions, if Naruto has three bijuu, they could be the Nine - Tails (Kurama) which he already has in the original series, perhaps the Eight - Tails (Gyuki) as it has a connection with Naruto's world and Akatsuki's hunt for the bijuu. And another could be the Three - Tails (Isobu). However, it really depends on the specific plot and creative direction of the fanfiction.