In this fanfiction concept, it could lead to a really interesting dynamic. Jiraiya is a powerful and eccentric ninja. He could teach Naruto some really unique jutsu, like more advanced forms of Rasengan. And their relationship would be filled with Jiraiya's boisterous personality clashing and also complementing Naruto's determination.
One thing that could happen is that Naruto would learn a lot more about the toad sage mode earlier. Jiraiya could start training him right away. This would give Naruto an edge in battles. He would be able to use the toad - related jutsu more effectively and have a different combat style.
Well, Naruto might learn some unique jutsu from Anko. Since Anko is known for her snake - related techniques, Naruto could incorporate some of those elements into his own fighting style. Maybe he'd become even more unpredictable in battles.
In the fanfiction, Naruto's new sensei could be a mysterious figure who has ties to the Sage of Six Paths. This person might have been waiting for the right time to appear and train Naruto. They could possess knowledge about the origin of chakra and how to fully unlock Naruto's power. It could also be someone who was once an enemy but has now changed their ways and wants to use their skills to train Naruto for the greater good of the ninja world.
There's a chance that Naruto's new sensei could be a self - taught ninja who has developed their own unorthodox style. This person sees Naruto's ability to think outside the box and wants to refine that in him. They could introduce Naruto to a new way of looking at chakra control and combat strategies that are completely different from what he has been taught so far.
It would be more nurturing. Kurenai could cook for Naruto, like making him some of her special ninja - style meals. And she'd be there to listen to his problems, whether it's about his love life or his struggles with mastering new jutsu. Their relationship would be based on mutual trust and respect, just like a real sister - brother relationship.
In some Naruto fanfictions, Minato could potentially be Kushina's sensei. He was highly skilled and had a connection with her, so it's a plausible idea in fan - created stories.
In most Naruto fanfictions, there is no such plot where Kurenai cheats on Naruto because they don't have that kind of relationship in the original story. Kurenai has her own story arc mainly related to Asuma. So it's very unlikely to find such a scenario in regular Naruto fanfictions.
Often, they are highly skilled in ninjutsu. Since Kushina herself was a powerful kunoichi, her sensei would need to have a great deal of knowledge and ability in combat techniques.
The child might have Naruto's ability to use the Rasengan. Since Naruto mastered this powerful jutsu, it could be passed down. And with Kurenai's genjutsu skills, the child could also be a master of illusions. Maybe they could even combine the two, creating a new and unique jutsu that uses the power of the Rasengan within a genjutsu.