In this fanfiction, they could have a rather unique relationship. Demon Naruto, with his wild and untamed nature, might be tamed by the gentle yet fierce Demon Kushina. They could discover new powers together as a couple. Their love story could be a symbol of hope in a world full of darkness and prejudice against demons.
One possibility is that they could have a story full of adventure. As demons, they might face challenges from the ninja world that fears them. But their love for each other gives them the strength to stand together. They could go on quests to prove that not all demons are evil, and in the process, their relationship deepens.
Theirs could be a love that defies the norms. In a world where most relationships follow certain rules and traditions, their romance as demons could break those boundaries. This could cause a stir among the older generations who are more set in their ways. However, it could also give hope to the younger generation who might be more willing to embrace change and new forms of love.
Well, perhaps Demon Naruto has some sort of special connection to Kushina that is related to his demonic powers. For example, her Uzumaki bloodline might be the key to controlling or understanding his demonic side better. And they could go on a journey to discover the secrets of his powers together.
Their relationship could start with Kushina being curious about Demon Naruto's powers. This curiosity could lead to them spending more time together and gradually building trust.
It could be an old rival of Naruto's who has fallen to the dark side and now uses a masked form to hide their identity. Maybe someone like Sasuke if he had been further corrupted by Orochimaru's teachings. Another possibility is that it's a new character created specifically for the fanfiction. This new character could be a rogue ninja from a far - off land who has a grudge against the Hidden Leaf. Or perhaps it's a resurrected villain from the past, like Madara Uchiha, who has been transformed into a masked demon through some dark jutsu.
A possible plot could be that there is a prophecy about Demon Naruto and Kushina. They have to work together to fulfill this prophecy which involves saving the ninja world from a great disaster. Along the way, they face many challenges. Kushina helps Naruto come to terms with his demon side, and Naruto uses his power to protect Kushina from the various threats they encounter. Their relationship evolves as they struggle to complete their task.
In this fanfiction scenario, Naruto might have to adapt to the harsh and secretive ways of the Mist. He could use his new status to bring about change. Maybe he'd combine his own ninja way with the Mist's traditions, like using his shadow clones in unique Mist - style assassinations. He could also face a lot of internal conflict as the Demon of the Mist is often associated with darker deeds, while Naruto is a hero at heart.
In fanfiction, the relationship might start with curiosity. Kushina could be curious about Naruto's demon side. She starts to study it and in the process, gets closer to Naruto. As she helps him understand and control his powers better, they become friends. Then, as they spend more time together, they realize they have feelings for each other that go beyond friendship. They support each other through difficult times, like when Naruto has to face the negative aspects of his demonic form, and Kushina has problems in the village. This continuous support deepens their relationship.
Well, it could be from an ancient and dark realm. Maybe it was forged by a powerful and evil blacksmith long ago. The sword might have been lost for centuries until Naruto discovers it by chance during one of his adventures.
The plot might involve Naruto being drawn to a demon that has unique powers. He starts to love the demon because it represents something different from what he's used to in the ninja world. For example, the demon could have the power to heal wounds that normal ninja techniques can't. Naruto, always eager to help others, sees great value in this. Their relationship grows as they face challenges together, like fighting against other demons or ninja who want to use the demon's power for evil.
Well, the plot could involve Naruto having the powers of a frost demon. Maybe he discovers this hidden power within him during a difficult battle. He then has to learn to control it, which could be a struggle as his normal ninja skills are so different. His friends might be initially scared or confused by this new side of him.