It could be Shino. Shino is a very knowledgeable shinobi, especially when it comes to his unique bug - based jutsu. Naruto, being eager to learn new things, would be drawn to Shino. Shino could also be interested in Naruto's Uzumaki heritage and the powerful jutsu that come with it. They could exchange knowledge and build a strong bond through that.
I think Naruto would interact a great deal with Hinata. Hinata has had a crush on Naruto for a long time. In Team 8, she might be more open with her feelings. Naruto, being kind - hearted, would notice her kindness towards him. They could have some sweet moments together while also training and going on missions as part of the team.
Sasuke would likely have a complex reaction. On one hand, he has his own goals with Team Taka, but on the other, Naruto is his old rival and friend. Suigetsu might be initially skeptical of Naruto, seeing him as an outsider, but gradually come to respect his power. Karin would be intrigued by Naruto's chakra, and Jugo might find Naruto's positive energy both strange and appealing.
Definitely Ruby. She's the main character in RWBY, and Naruto would be drawn to her positive attitude and determination. They could learn a lot from each other. Naruto could teach her about the importance of never giving up like he did in his own journey, and Ruby could show Naruto how to use Dust.
Naruto is very outgoing and loud, while Shisui seems more reserved. Naruto's energy might at first be a bit overwhelming for Shisui, but over time, Shisui would come to appreciate Naruto's positive attitude. Naruto, on the other hand, would be in awe of Shisui's skills and might try to learn from him.
Hinata could befriend Ruby. Ruby is the leader of Team RWBY and Hinata is a key member of Team 8. They both have a sense of loyalty and a strong will to protect. Hinata could show Ruby some of her gentle fist techniques, and Ruby could introduce Hinata to Crescent Rose and how it works. Their friendship could be based on mutual respect for each other's combat abilities.
Ruby Rose for sure. They both have a strong sense of justice and a desire to protect others. Naruto would be intrigued by Ruby's scythe and her use of Dust. And Ruby would be interested in Naruto's ninja tools and jutsu.
In this fanfiction, Naruto would interact with Vesemir, the old and wise Witcher. Vesemir could see Naruto's potential and help him understand the history and traditions of the Witchers. Naruto would also run into the various monsters in the Witcher world. Instead of just fighting them right away, he might try to communicate with them first, like he did with some of the tailed beasts in his own world. His interactions with these creatures would be unique and could even change the way Witchers view certain monsters.
Naruto's boisterous and positive personality would contrast with Sasuke's more brooding and serious nature. Hinata, being shy and gentle, would act as a sort of mediator. For example, when Naruto gets over - excited about a mission, Sasuke might roll his eyes, but Hinata would gently calm Naruto down. At the same time, Sasuke's intensity could inspire Naruto to train harder, and Hinata would be in awe of their skills, which could boost her confidence.
Sakura might be the most surprised. She has always been very close to Naruto, and seeing him as a powerful future version would be quite a shock. She might be amazed at how he has developed his skills and also how he has changed as a person.
Gwen Stacy, Spider - Gwen, could be an interesting partner for Naruto. Her acrobatic fighting style and her punk - rock attitude could contrast with Naruto's more boisterous ninja personality. Together, they could create a visually stunning and action - packed team - up, with Naruto's clones and Gwen's drumming skills (which she uses in combat in some versions) adding unique elements to their battles.
He would surely interact with Harry Potter. They could share their experiences of being the main defenders in their respective worlds. Naruto might also interact with Dumbledore. Dumbledore would be interested in Naruto's unique abilities and Naruto would respect Dumbledore's wisdom.