Well, in fanfiction, the 'Naruto Sealed Hatred' form is a concept that allows for a lot of creativity. It could mean that Naruto's experiences that might have led to hatred, like the way the villagers treated him as a child, are nullified in this form. Maybe he becomes a more 'pure' version of himself. This form could also be used to set up unique storylines, such as Naruto having to face an enemy who wants to release his sealed hatred for their own evil purposes.
It can simplify the plot. Without Naruto's internal struggle with hatred, he may make more rational decisions, which can speed up the resolution of conflicts in the story.
In many such fanfictions, it could be a variety of deities. It might be an ancient and powerful god from Naruto's world's mythology that the story's author has chosen to insert. For example, it could be a god of elements like a super - powerful fire god, which could give Naruto even more control over his existing fire - based jutsu and new, more extreme abilities related to fire.
In some fanfictions, Kushina was sealed into Naruto through a complex jutsu. It might be a modified version of the sealing jutsu used to seal the Nine - Tails. The process could involve special incantations and chakra manipulations.
In some Naruto fanfictions, Madara might be sealed through a powerful jutsu created by the main character. For example, the protagonist could combine different elemental chakra natures to form a unique sealing technique specifically designed to counter Madara's power.
Well, in some Naruto fanfictions, Bardock might be sealed by powerful jutsu. Maybe a dark ninja uses a forbidden sealing technique to lock him away, preventing him from interfering with their evil plans.
Well, one reason could be that the author wants to explore an alternate universe. Maybe in this fanfiction's version of the Naruto world, the events leading to the sealing of the Kyuubi never occurred. It could be due to different political situations among the ninja villages, or perhaps a different chain of events that prevented the Kyuubi's attack on Konoha in the first place. So, without the attack, there was no need for the seal.
In 'hatred naruto fanfiction', there may be themes related to the power of hatred. Some stories might depict characters becoming stronger because of their hatred, which is a departure from the traditional Naruto ideology that emphasizes love and friendship. There could also be themes of isolation, as characters filled with hatred tend to isolate themselves from others in these stories.
In Naruto fanfiction, the 'Power of Hatred' can often lead to characters making extreme decisions. For example, they might abandon their previous moral compasses. This power can fuel dark and powerful jutsus, as seen in some fanfics where characters like Sasuke are further influenced by hatred, causing him to be more ruthless in battle and his pursuit of power.
It's often shown as a very intense and consuming force. Characters filled with this power might have a dark aura around them in the fanfiction. Their eyes could glow with a menacing look, signifying the 'Power of Hatred' within.