Well, Kakashi might start by spending more time with Naruto. He could train Naruto more intensively, like teaching him new jutsu. Maybe he also shares his own experiences to give Naruto some guidance and motivation.
A plot development could be that Kakashi discovers the root cause of Naruto's neglect. It might be related to some hidden secrets in the village. Then Kakashi has to fight against those who are behind Naruto's neglect while still training Naruto. Another development could be that Naruto and Kakashi form a very strong bond. Naruto then uses the skills and confidence he gained from Kakashi to face his enemies and also to try and change the village's attitude towards him.
One memorable moment could be when Kakashi finally reveals a powerful new jutsu to Naruto that completely changes the way he approaches battles. Another might be when Kakashi saves Naruto from a near - fatal attack during a tough training session.
In this fanfiction, Kakashi could help Naruto in his training through mental conditioning as well. Naruto is often impulsive, so Kakashi may work on his patience and decision - making skills. He could use his Sharingan (if applicable in the fanfiction) to analyze Naruto's movements during training and give him detailed feedback. Moreover, Kakashi could introduce Naruto to different types of enemies and battle scenarios in a controlled training environment, which would broaden Naruto's understanding of combat and make him a more versatile ninja.
In such a fanfiction, Naruto might become extremely powerful under Kakashi's training. He could learn new jutsus faster and gain better control over his chakra. Maybe he'd also develop a closer bond with Kakashi, different from his relationship with Iruka or other characters in the original story.
Maybe Kakashi is preoccupied with other important missions. He is a highly - skilled and often - needed ninja. There could be some top - secret missions that require his full attention, leaving him no time to train Naruto properly.
Naruto might also try to find alternative ways to gain strength. He could explore the forest around the village to find new training areas or discover new chakra - related phenomena. He has a curious nature, and this could lead him to stumble upon something that gives him an edge in his training, like a hidden hot spring that has special chakra - enhancing properties.
Often, there's a plot point where Naruto discovers a hidden talent or power on his own because Kakashi isn't there to guide him. He might also get into more trouble than usual as he tries to prove himself without Kakashi's approval. And sometimes, the other members of Team 7, like Sasuke and Sakura, start to notice Kakashi's neglect of Naruto and try to make up for it in their own ways, which can create some interesting group dynamics in the fanfiction.
Kakashi might also help Naruto understand the importance of teamwork in fanfiction. He could organize team - building exercises or put Naruto in situations where he has to rely on others. By doing this, Naruto would learn how to work better with his comrades, which is a crucial aspect of being a good ninja.
Well, in such a fanfiction, Naruto might become more self - reliant. Since he's being neglected by Kakashi, he has to find ways to train and grow on his own. This could lead to him developing a tougher exterior and being more determined to prove himself.