Naruto may run into some friendly space explorers who are amazed by his ninja skills. They could help him navigate the strange new world of space and introduce him to advanced technologies that are different from what he's used to in the Hidden Leaf Village. There might also be some wise, old beings in space who can teach Naruto new ways to master his chakra.
Naruto would meet his younger self. This would be a really strange situation. He could also meet all the important shinobi from the past. For example, the First and Second Hokage. He might have a chance to learn from them directly, instead of just hearing about them in stories. Additionally, he could meet some of the characters who were only mentioned in passing in the original story but had a big influence in the past.
He could meet an AU version of Hinata who is more assertive and outgoing. Maybe she's a powerful ninja in her own right and not as shy as in the original story.
Naruto might meet a wise alien sage who has knowledge about a different type of energy that could enhance Naruto's own powers. This encounter could lead to Naruto's growth and development in new and unexpected ways. He could also meet some friendly space creatures that help him on his journey through space.
One idea could be that Sarada travels back in time and initially mistakes Naruto for Sasuke. This could lead to some humorous misunderstandings as she tries to interact with him. For example, she might challenge him to a fight thinking he's Sasuke, only to be completely surprised by Naruto's different fighting style and personality.
He could meet alternate versions of his friends. For instance, an alternate Sasuke who has never left the village and is a strong ally from the start. This Sasuke could be more open and friendly, and together they could face the challenges of the new universe.
Well, Naruto might use his chakra powers in unique ways in space. Maybe he has to fight new enemies out there, like some alien ninja clans. He could also learn new jutsu from alien species that are based on different forms of energy found in space.
There might be an old sage living in the mountains of one of the elemental nations. The sage has vast knowledge of ancient ninja arts and has been in isolation for years. Naruto's encounter with this sage could be a turning point in his journey, as the sage could offer him wisdom and perhaps even a new form of power or training method.
He could meet some space - faring ninjas who have adapted to the space environment. They might have unique chakra powers related to the cosmos.
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.
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.