What might be the challenges Kakashi faces while babysitting Naruto in fanfiction?

One challenge could be controlling it. Haki is a different kind of power compared to chakra, so Naruto would have to learn how to regulate the flow and intensity of his haki. For example, if he uses too much haki at once, it might drain him quickly.

One challenge could be controlling the natural energy. Since senjutsu involves harnessing natural energy, Naruto might find it difficult to balance it with his own chakra. It's like trying to mix two very different substances without causing an explosion.

One challenge could be the complexity of the technique itself. Hiraishin is a very advanced ninjutsu, and Naruto might struggle to understand the chakra control required for it.

Chakra depletion is also a big issue. With all the chakra - control exercises and sparring, Naruto could run out of chakra quickly. This would not only limit his ability to practice jutsu but also leave him vulnerable in case of an unexpected attack during training.

One of the main challenges could be the lack of immediate feedback. When training alone, Naruto doesn't have a partner to correct his mistakes right away. For example, if he's working on a new jutsu, he might not realize he's performing it slightly wrong until it fails completely. Also, he has to motivate himself without the competition or support of his peers. He might get bored or frustrated easily since there's no one around to cheer him on or push him further.

One challenge is controlling the amount of nature energy. It's not easy to balance it with his own chakra. Also, Kurama's chakra can be a bit wild, and combining it with senjutsu chakra requires a lot of focus. Another thing is that Naruto has to learn new techniques quickly, which can be mentally taxing.

In the fanfiction, Kakashi might face the challenge of Naruto's insecurities. Naruto has always had a complex about being alone and not having a family. Kakashi would have to find ways to make Naruto feel secure and loved. Also, dealing with Naruto's powerful and sometimes uncontrollable chakra could be a problem. Kakashi would need to train Naruto to master his chakra properly without it overwhelming him.

One challenge could be controlling the chakra flow for creating the marks accurately. Naruto has a large amount of chakra, but it's wild. So, he might find it difficult to precisely form the marks required for Hiraishin.

Another problem might be the lack of proper resources. Even if Naruto has the ability to heal, he may not have all the necessary herbs or medical equipment. In the world of Naruto, some healing requires specific items. If they are in a remote location or in a battle - torn area, getting these resources could be a huge hurdle.

One challenge Naruto might face is Gaara's past traumas. Gaara has been through a lot of pain and isolation, which has made him distrustful. It would be difficult for Naruto to break through those barriers and get Gaara to open up. Another challenge could be the political situation. Suna and Konoha have had their differences in the past, and some in Suna might not be happy with Naruto's influence on Gaara. Naruto would have to deal with any potential political unrest or opposition from those who don't trust Konoha.