Sasuke is often one who can keep up. He has his own incredible speed and Sharingan - enhanced reflexes. Another could be Minato, Naruto's father. Minato was known for his speed, so in fanfiction, he might be able to match Naruto. Rock Lee in his Eight Gates mode could also be a contender as he can achieve insane speed.
One example could be that he always stumbles upon hidden jutsu scrolls by pure chance. Like he might be exploring an old, forgotten cave and just happen to find a super rare and powerful jutsu scroll that gives him an edge in battles.
Well, it can make the plot more exciting. Since he's so lucky, there are always unexpected twists. For example, if he's in a tough mission, his luck might lead to finding shortcuts or secret passages that no one else knew about, which would then change the whole direction of the mission and the story.
There was no clear difference between extreme speed and extreme speed. The word extreme speed is usually used to describe the highest speed or the ultimate speed, while the word rapid and rapid means very fast. Speed might indicate the urgency in people's hearts, and the difference between speed and speed was that speed was faster. However, these results did not provide an explanation for the specific phrase " extremely fast." Therefore, according to the information provided, I don't know what exactly 'extreme speed' means.
Kakashi could be a key character in the fanfiction. As Naruto's former teacher, he could provide guidance and set up the extreme training regimens for Naruto. Also, characters like Jiraiya might be present. Since he trained Naruto in the original series, he could play an important role in this extreme training scenario, perhaps teaching Naruto some advanced toad - related techniques.
Naruto and Sasuke are still really popular in extreme fanfiction. Their complex relationship and powerful abilities make them great subjects for fan - created stories. Sakura also has her share of popularity as she can be developed in different ways in fanfiction, like becoming a super - strong medic - ninja.
One exciting scene could be when Naruto races against an enemy who is also known for their speed. His sudden bursts of speed, leaving a trail of dust behind him as he zooms past buildings and trees, would be really thrilling.
Definitely Gai. His whole shtick is about speed and he has amazing techniques like the Eight Gates. He can teach a lot about physical speed and the willpower needed to push one's limits. Also, Minato is a great choice. His Flying Thunder God Technique requires incredible speed and reaction time, so he could offer valuable insights.
Sasuke could be his rival. Sasuke is known for his competitiveness and would see Naruto's entry into the Need for Speed world as a challenge. He would use his Sharingan to analyze Naruto's moves and try to outdo him on the race track.
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Orochimaru could also be a character to beat up Naruto in a fanfic. He's always been interested in the power of the Nine - Tails and Naruto as a whole. He might see an opportunity to capture Naruto and in the process, end up beating him up to subdue him.