Maybe Kakashi could be the one. He's always been Naruto's mentor in many ways. He has the knowledge and skills to train Naruto for such an unusual task. He could use his Sharingan to analyze the fanfiction and teach Naruto how to spot the dangerous elements within it.
One possible plot could be that Naruto starts off as his normal self but as he is trained by the fem Kyuubi, he gradually gains godlike powers. He then uses these powers to protect Konoha from a new, powerful threat.
One great 'Naruto Might Guy fanfiction' is 'The Unstoppable Might Guy'. It really captures his spirit. It shows him in various challenging situations where his determination and unique fighting style shine through.
One unique aspect is the exploration of his relationship with Rock Lee in more depth. In fanfiction, we often see their bond being developed further, like in 'Lee and Guy: The Mentor - Mentee Bond', which shows how they support each other in ways not fully explored in the original series.
He could gain the ability to sense death. Maybe he can tell when someone is close to dying or if there's a dangerous situation that could lead to death. It would be like a sixth sense.
In fanfiction, Naruto could gain enhanced sensory abilities. Since toads are known for their connection to nature, Naruto might be able to sense things from a greater distance, like the movements of enemies or the flow of chakra in the environment. This would give him an edge in battles.
It could be that Might Guy is under some sort of mind - control. So, without his normal self - control, he attacks Tenten, making it necessary for Naruto to save her.
Maybe Sasuke. Sasuke is extremely proficient in kenjutsu. In fanfiction, he could see Naruto's potential and decide to train him, sharing his knowledge of sword fighting with Naruto. This could also be a way for them to bond and grow stronger together.
The guy could be thinking about how confident she seems. If she's walking tall and has a certain air about her, he may be in awe and thinking about how he wishes he could be more like that. For instance, if she's in a business suit and looks very self - assured, he might be thinking about how she must be successful in her career. He might also be thinking about how he could start a conversation with her without seeming creepy.
Naruto would gain better combat awareness. Kurama's experience in battles can be passed on to Naruto. He'll be able to read his opponents better, know when to attack and when to defend. This will make him a more formidable opponent in combat situations.