One interesting plotline could be Naruto struggling to control his new wolf demon powers. He might accidentally lash out at his friends, creating a rift between them until he learns to master his abilities.
Another possible plotline is that Naruto's transformation into a wolf demon is part of a prophecy. With this new form, he has to face an ancient evil that only he, in his wolf demon state, can defeat. This would involve Naruto growing in strength and wisdom as he comes to terms with his new identity.
One possible plotline could be Naruto struggling to control his new kitsune powers. For example, he might accidentally use them in the middle of the village, causing chaos and making the villagers even more afraid of him. Another could be that he uses his new form to outwit powerful enemies who were previously too strong for him.
One possible plotline could be Naruto's struggle to adapt to the physical and social changes of becoming Naruko. He might face new challenges in how others perceive him/her, like dealing with different expectations in the ninja world. Another could be exploring new relationships, as Naruko might interact differently with characters like Sasuke or Sakura.
Well, one possible plotline could be Naruto's discovery of his new wolf god powers. Maybe he starts to have a deeper connection with nature and can communicate with wolves. He could use these powers to protect the village in unique ways, like summoning wolf packs to aid in battles.
A common plotline is the 9 - Tailed Wolf teaching Naruto unique chakra control techniques. This gives Naruto an edge in combat.
Another plotline could involve how Naruto's relationships change. For example, his friendship with Sasuke might be affected as Sasuke could be either more wary or more intrigued by Naruto's new 'demon' aspect. His relationship with his teachers like Kakashi might also shift as they try to help him manage this new power.
One interesting plotline could be the exploration of the Demon of the Mist's backstory. Maybe it reveals how the demon came to be associated with the Mist Village in the first place. Another could be a story where a character has to face the inner demons inspired by the Demon of the Mist and overcome them through self - discovery and growth.
Maybe a plot where Naruto, through some magical accident, gets transported to a world full of demonesses who all see him as a potential mate. He then has to use his ninja skills and his kind heart to navigate this new world and the complex relationships within the harem. For example, he might have to fight in some demon battles to prove his worthiness to be in the harem.
One interesting plotline could be Naruto facing new and unexpected threats to the village as Rokudaime Hokage. He might have to deal with political intrigue within the village as some may not fully accept his leadership at first.
There are fanfictions where Naruto as a wolf demon is part of a hidden clan. This clan has been in hiding because of the fear of being persecuted for their wolf - like features and powers. Naruto discovers his true identity gradually. His training as a ninja takes on a new dimension as he has to learn to control his wolf demon instincts. He might have to struggle between his human side and his wolf demon side, especially when it comes to using his powers for good or succumbing to more primal urges.
Maybe there is an ancient wolf demon spirit that is corrupted and sees Naruto as a threat to its reign. This spirit would try to either kill Naruto or corrupt him further, causing chaos in the world.