He would most likely meet his father, Minato Namikaze, and his mother, Kushina Uzumaki. These are the two main family members he never really got to know growing up.
In this fanfiction, Naruto could also meet any siblings he might have had if things had been different. They could bond over their shared bloodline and have some fun adventures together, exploring their family's secrets and powers.
Besides his parents, Naruto might also meet his extended family. Maybe some distant relatives who were also ninjas and they could share stories about the family's ninja heritage. He could also meet his ancestors who had a great influence on the Uzumaki clan.
It could be Sakura. She has been Naruto's friend for a long time. She would be excited to see him return. They might share a heartfelt reunion, and Sakura could tell Naruto about the medical advancements in the realm while also asking about his adventures away.
He would most likely meet his parents, Minato and Kushina.
There's a good chance he meets Kakashi first. Kakashi was his mentor and they have a strong bond. Kakashi might be out on a mission near the place where Naruto returns, or just be around the village doing his usual thing like reading his book at the training ground.
In this fanfiction, Naruto might finally have an emotional reunion with his parents. He could share all his adventures, growth, and the pain he endured. They would likely be proud of how he became a great ninja.
He might meet Iruka first. Iruka was always like a father figure to Naruto, and it would be a very heartwarming reunion. Iruka would probably be one of the first people to welcome Naruto back with open arms.
He might meet an old acquaintance who is also alone. They could share their stories and perhaps find some comfort in each other's company.
Naruto might run into a group of rogue ninjas who are using the bunker as their hideout. This would lead to a confrontation where Naruto has to use his skills to defeat them and protect the village from their potential threats.
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.
Naruto might meet Itachi in heaven. Itachi could finally reveal all the secrets and the true intentions behind his actions to Naruto. And they could become true friends without any misunderstandings. Additionally, Naruto could also meet Neji, and they would talk about how the ninja world has changed since Neji's sacrifice.
Naruto could also meet the previous Hokages in their prime. He could learn from them directly and perhaps even influence their decisions. For example, he might be able to convince the First Hokage to handle the Uchiha clan's situation differently, which could have a huge impact on the future (or in this case, the future that Naruto comes from).