We don't know who 'he' is from just this phrase. 'He' could be a random person within a group that had an interest in Naruto. Maybe it was a guy who was the first to share a Naruto fanfiction with the rest of the group, or the first to show enthusiasm for creating or reading such fanfictions. Without further context, all we can do is speculate.
It could mean that he was the first person among 'us' to create or be associated with a Naruto fanfiction.
Perhaps Naruto would meet Rukia first. Rukia is often out on missions and is one of the more accessible Soul Reapers. She would be really curious about Naruto's strange appearance and abilities. And Naruto would be equally intrigued by Rukia's spiritual powers and the way she handles her zanpakuto.
I'm not sure who 'he' is without more context. It could be a friend, a family member, or someone who is really interested in your stories.
It could also be someone who has a secret crush on you. They are so interested in you that they make sure to be the first to see any new stories you share, hoping to get a glimpse into your world and feel closer to you.
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.
It could be Kakashi too. Kakashi is very experienced and observant. He might notice Naruto's confusion or struggle with the new contract and offer his insights. He could share some of his own experiences with summons to help Naruto figure things out.
Well, without more context, it's hard to say exactly who 'he' is. He could be a friend, a family member, or someone who just happens to be very interested in your stories. Maybe it's your best friend who always checks your updates first.
He might face disappointment from his friends and mentors. They had high hopes for him in the exam, so his quitting could lead to some strained relationships at first.
He might immediately try to test out Sesshomaru's powers. Naruto is always eager to understand his own abilities better, and in this new form, he would be no different. He'd probably start by seeing how far he could jump or how strong his new claws are.
He could face Sasuke. Their rivalry is well - known, and it would be an epic battle in the tournament.