There's no way to tell for sure who the creator of 'the first naruto the fanfic' is without more information. It could be a Naruto superfan who just wanted to put their own spin on the story, or it could be part of a fan community project where multiple people contribute ideas. Since fanfics are often shared anonymously or under pen - names, it's really hard to track down the exact creator.
I'm not sure specifically as there could be many different 'first Naruto fanfics'. It might be about the origin story of Naruto in that fan - created version, perhaps exploring his early days in the Hidden Leaf Village, his relationships with characters like Iruka - sensei, or his first attempts at ninja training.
I'm not sure exactly as I haven't read this specific 'naruto first grimm fanfic'. It could be a fan - made story that combines elements from Naruto and Grimm. Maybe it has Naruto characters in a Grimm - like world or vice versa.
There could be a fanfic where Naruto has to go on a long - distance mission. Hinata is worried about him. Right before he leaves, she runs up to him and hands him a handmade charm for good luck. Naruto is touched. He pulls her into an embrace and then kisses her gently on the lips, marking their first kiss. It's a bittersweet moment as he then has to leave on his mission.
In a fanfic, perhaps after the war, Naruto is feeling a bit lost. Hinata is always there by his side, supporting him. One day, they are sitting on the Hokage Rock, looking at the village. Naruto starts to talk about his dreams for the future and how much Hinata means to him. Without thinking too much, he just turns to her and plants a gentle kiss on her lips, which is their first kiss.
Some fans create 'naruto hiruzen bashing fanfic' because they feel Hiruzen made some big mistakes. For example, his handling of the Uchiha clan issue. He knew about the growing unrest but didn't take effective steps to prevent the tragedy. So fans write to show their dissatisfaction with his leadership in such matters.
Most likely he would befriend Natsu. They are both really headstrong and passionate about their respective skills. Natsu would be intrigued by Naruto's ninja abilities and Naruto would be interested in Natsu's fire - dragon - slayer magic. They would probably start off by challenging each other to a friendly fight and from there develop a bond of mutual respect.
One thing to expect is Naruto trying his best to impress Sakura. He could show off some of his new ninja skills in a non - showy way, like casually using his shadow clone to get them some ice cream from a far - away vendor. Sakura would be both amused and impressed.
It could entail the first male ninja's struggle to gain acceptance in a world that might be dominated by different power structures initially. Maybe he was from a small village and had to prove himself against bigger, more established ninja groups.
A Naruto fanfic focused on the first male ninja could explore many unique aspects. For example, it could delve into the origin story of male ninjas in the Naruto universe. Maybe it would show how the first male ninja developed his skills, like mastering chakra control in a different way compared to later generations. It could also explore his relationships with other early ninjas, whether they were friends or rivals.