There could be a rogue ninja hiding in the cave. This ninja might be on the run from the authorities and has some secrets that Naruto is interested in. Maybe they end up teaming up for a while.
Sakura could be the one to find him crying. She has known Naruto for a long time and they are comrades. If Naruto is in a vulnerable state, she might stumble upon him.
Maybe some of the younger ninja like Boruto or Sarada could stumble upon Naruto's cave while on a training mission. They could be curious about this strange hermit - like figure in the cave and later realize it's Naruto. This could lead to a mentoring - like relationship between Naruto and the new generation.
His old mentor, Iruka, might visit. Iruka has always cared about Naruto. He could bring some supplies and words of encouragement. He might also be worried about Naruto's well - being and want to make sure he's okay living in the cave.
It could be a rogue ninja from a hidden village. There are always some ninjas who go against their village's rules and become outlaws. They might target Naruto because of his reputation or the power of the Nine - Tails within him.
His friends like Sakura, who is a medic - ninja, would surely be the first ones to try to help. She could use her medical knowledge and skills to diagnose Naruto's illness.
Definitely. There might be a group of bandits or rogue ninjas using the cave as their hideout. They would see Naruto as an intruder and attack him. Or perhaps there are some cursed objects in the cave that start to affect Naruto's mind and body in a negative way.
People who enjoy fanfiction that plays with the physical attributes of characters might be drawn to it. They could be curious to see how a petite Naruto would change the dynamics of the story.
Probably a fan who has a really creative and humorous take on the Naruto character. It could be someone who wants to explore a different side of Naruto, something that the original series didn't show much of.
Maybe a rogue ninja group that wants to sell Naruto to the highest bidder. They see him as a valuable asset due to his strength and status in Konoha.
Naruto could meet some young and upcoming Iwa ninja trainees. They might be curious about Naruto and his abilities from Konoha. These trainees could either look up to Naruto or be jealous of his fame, leading to various interactions. Also, there could be some old - timer Iwa ninjas who remember past events involving Konoha and have their own views on Naruto's presence in Iwa.