It would probably be full of intense training sessions. Naruto would grow up with Gai's energetic and positive attitude. He'd likely learn all of Gai's unique jutsu and fighting styles at a very young age, becoming an extremely physical fighter.
Maybe it's an existing minor character from the Harry Potter universe who is given a new identity and role as 'gai'. For example, a little - known wizard who has been living in seclusion but has some extraordinary abilities and decides to take Harry under his wing.
Perhaps Gai, being a character with strong beliefs, would raise Harry to have a different perspective on the battle between good and evil. Instead of the traditional black - and - white view in the Harry Potter series, Harry, under Gai's influence, might see that there are more shades of gray. Gai could also introduce Harry to a different set of allies and enemies, which would completely change the course of Harry's adventures in the wizarding world.
I'm not entirely sure as I haven't read this specific fanfic. But generally, if it's 'Harry raised by Gai', it might be a story where a character named Gai takes on the role of raising Harry in an alternate universe or fan - created scenario.
Lee would probably be Naruto's closest ally. They both have a strong will and are not afraid to face challenges head - on. They could bond over their mutual desire to become stronger and prove themselves. Lee's enthusiasm for taijutsu might inspire Naruto to improve his own physical combat skills, and Naruto could in turn teach Lee some of his unorthodox ninja techniques.
Naruto could use his shadow clone jutsu to create distractions. While Gai is busy dealing with the clones, Naruto can quickly get Tenten to a safe place.
One possible fanfiction could be about Gai teaching Naruto the power of his 'eyebrow' spirit. Naruto, always eager to learn new ways to become stronger, might initially be confused but then start to understand the significance of Gai's expressive eyebrows in his own unique way of combat. For example, Gai could show Naruto how his confident eyebrow raises can intimidate opponents, and Naruto could incorporate that into his own fighting style, like using it to psyche out enemies before launching a Rasengan.
There's not enough information to determine exactly who Gai is. It could be a fan, a self - appointed protector within the fanfiction community, or perhaps someone with a personal connection to the Sakura concept in the fanfiction.
One possible plot could be Naruto joining Team Gai and having to adapt to their intense training regime. He might struggle at first with Gai's over - the - top enthusiasm for youth and challenges. For example, he could have a hard time keeping up with Lee's taijutsu training sessions. But as time goes on, Naruto learns valuable lessons about discipline and perseverance from his new team.