One interesting storyline could be a dog in the Naruto universe that has a special collar which gives it unique powers. Maybe it was a gift from a powerful ninja, and the dog uses it to protect its owner during battles. Another could be a story where the dog collar is a key to unlocking an ancient ninja secret related to the canine ninjas in Naruto.
One possible storyline could be that Naruto discovers his nin dog has a special power. For example, the dog might be able to sense things that other ninjas can't, like hidden traps in a mission area. This could lead to Naruto and his team being able to avoid dangerous situations and complete their missions more smoothly. Another storyline could be the nin dog getting lost during a battle and Naruto has to search for it while also facing the enemy. It would add an emotional aspect as Naruto is very attached to his pet.
The dog collar can be a plot device. If it has special powers, it can change the course of battles. For example, if it can create force fields, it can protect the dog and its owner from enemy attacks.
One possible storyline could be about the significance of the Kensis Collar in the Lost Girl universe. Maybe it has some magical powers that are yet to be fully explored. For example, it could be a key to unlocking a hidden realm within the show's world.
One interesting Naruto collar fanfiction could be about a special collar that has hidden powers and is given to Naruto by a mysterious figure. This collar might enhance his abilities in unique ways.
One interesting storyline could be Naruto finding himself in Artemis' realm. He might initially be confused by the different world but then start to learn about Artemis' powers and the nature of her domain. His ninja skills could be put to the test in a new and magical setting.
A cool storyline could be that Kurama gets a chance to experience the human world through Naruto in a more direct way. He gets to understand human emotions and relationships better, and this changes the dynamic between him and Naruto in unexpected ways.
One interesting storyline could be Naruto and Kurama forming a deeper bond beyond the usual jinchuriki - tailed beast relationship. For example, they might have to work together to save the Hidden Leaf from a new, powerful enemy that neither could face alone. This would involve Kurama sharing some of his ancient knowledge with Naruto to help in the battle.
One interesting storyline could be Naruto and Misty teaming up on a quest in a strange new land. Maybe they are searching for a powerful artifact that can save both their worlds. They'd have to combine Naruto's ninja skills with Misty's Pokémon handling abilities.
One interesting storyline could be Naruto joining Team 8 for a special mission. Maybe they are tasked with protecting a rare and powerful ninja tool. Naruto's unorthodox methods might clash with the more traditional approach of Team 8 at first, but they gradually learn to work together and combine their skills. For example, Naruto's shadow clones could be used in creative ways to scout out the area while Team 8 members use their tracking and stealth abilities to set up an ambush.
One interesting storyline could be a time - travel one where Naruto goes back in time and meets a young Mikoto. He could end up befriending her and changing some events in the Uchiha clan's history for the better. Another could be a story where Mikoto survives and she takes Naruto under her wing, teaching him some unique Uchiha jutsu.