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.
There's a possibility that Naruto meets Iruka first. Iruka was Naruto's first teacher and mentor. Their reunion would be a very emotional one. Iruka could be the first to welcome Naruto back to the realm, and Naruto would surely be happy to see the person who believed in him from the start.
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 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.
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 reunite with his old friends and sensei. He could show off new jutsus he learned during his time away. Maybe he'd also face new threats to his realm that only he can defeat with his unique skills and experiences.
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 could meet Hinata, and their relationship might develop further. Maybe she would be the first to greet him and express her admiration more openly.
There could be a group of kids on the beach who are inspired by Naruto. They might approach him and ask for autographs or to show them some ninja moves. Naruto would be happy to oblige and in the process, he could discover a new talent among the kids that could be important for the future of the ninja world.
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.
Maybe some local tribespeople who have unique abilities or knowledge. For example, they could teach Naruto some ancient techniques or survival skills that are not known in the Hidden Leaf Village. There might also be wandering samurai or other shinobi from different regions who pass by the outpost and interact with Naruto.
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.