Maybe in the fanfiction, Kakashi discovers a hidden power within baby Naruto that no one else has noticed. He then has to protect Naruto from those who might want to use this power for evil. This would involve a lot of action and mystery.
One interesting storyline could be Kakashi taking on a more fatherly role towards baby Naruto. He could teach Naruto some basic ninja skills from a very young age, like how to throw a kunai properly. This would create a strong bond between them early on.
Well, a great storyline might be that Naruto and Kakashi enter a mysterious forest that has some sort of ancient power. In this forest, they have to solve puzzles and fight off strange creatures. As best friends, they support each other throughout the ordeal. They also have deep conversations during their journey, like about Kakashi's relationship with Obito and Naruto's feelings for Sasuke. It would be a story full of adventure and friendship.
One interesting storyline could be Kushina teaching baby Naruto some basic ninja skills in a really gentle and loving way. For example, she might show him how to throw a kunai softly so he doesn't hurt himself. Another could be their interactions with the other villagers. Maybe Kushina takes Naruto around the village to introduce him to the different shops and people, which would be really cute as baby Naruto would be all wide - eyed and curious.
Another could be a story where baby Naruto has a special connection with Kushina's chakra, and this connection helps him in some unexpected situations. Maybe when he is in a dangerous situation, the memory of Kushina's chakra within him gives him an extra boost to escape or fight back. Well, it could also be a story about Kushina protecting baby Naruto from some unknown threats within the village. There could be some secret enemies who are after Naruto for some reason, and Kushina uses all her skills and wits to keep him safe.
One interesting storyline could be Naruto finding baby Sasuke alone in the forest and deciding to take care of him. Naruto, with his big heart, would do his best to protect Sasuke from any harm that might come their way, like facing off against wild animals or rogue ninjas.
Some storylines could involve Minato's friends, like Jiraiya, interacting with baby Naruto. Jiraiya could be like an uncle figure and teach Naruto some unique things. There could also be a story where Minato shows Naruto the beautiful places in the village, like the waterfall where he used to train. And then there could be a plot where Minato has to make a difficult decision to protect Naruto from a greater threat, like a powerful enemy who wants to use Naruto for his own evil plans. This could lead to some really emotional and heroic moments in the fanfiction.
Perhaps a storyline where the apprentice discovers a new jutsu and has to keep it a secret while they master it. They could struggle with whether or not to tell Kakashi, fearing disappointment if they fail. This adds an element of internal conflict.
Another storyline could be that the Akatsuki, seeing baby Naruto as a valuable asset, try to raise him as one of their own. But Naruto's innate sense of justice, which is there even as a baby, starts to change the Akatsuki from within. He might influence them to question their more villainous actions and motives.
Perhaps in the fanfiction, Kakashi is influenced by a dark power. This power corrupts his mind and makes him turn on Naruto. It could be related to some ancient curse or a new enemy's ability that targets Kakashi's mental state. Naruto, being the target, would then be at the mercy of Kakashi's attacks, creating a lot of drama and conflict in the story.
One possible storyline could be Minato and Kushina teaching baby Naruto some basic ninja skills in a really fun and loving way. They could be in a little family training session in their backyard, with Kushina showing Naruto how to throw a kunai gently and Minato teaching him about chakra control. It would be a really cute and heartwarming scene.
Perhaps a storyline where the apprentice gets involved in a mission that was originally meant for Kakashi. This could lead to the apprentice having to prove themselves not only to their teammates but also to Kakashi. They might encounter powerful enemies and have to use their wits and the skills they've learned from Kakashi to survive. In the process, they could also discover some secrets about Kakashi's past that helps them better understand their master.