A 'narusaku naruto returns fanfic' could be about many things. It might focus on Naruto's return in a scenario where he has a relationship with Sakura. It could involve adventures they go on together, how their relationship has developed during his time away and his return, and how they face new challenges in the ninja world as a couple.
Well, it depends on the specific fanfic. Some fanfics might really emphasize Naruto's growth to be on par with Minato in terms of smarts. They could show Naruto learning from Minato's memories or having some sort of spiritual connection that transfers knowledge. However, other fanfics might focus more on other aspects of Naruto's character and not necessarily make him as smart as Minato.
A fanfic could start with Sakura being jealous of all the attention Naruto gets from other girls. As she tries to figure out why it bothers her so much, she discovers that she actually loves him. Then the story could be about her trying to find the right moment to confess her feelings.
One great 'Smart Naruto Naruhina' fanfic is 'A New Path for Naruto and Hinata'. In this fanfic, Naruto's intelligence is shown in a new light as he strategizes to protect the village and his relationship with Hinata. It has a really interesting plot that delves into how Naruto's newfound smarts can change the Naruto universe.
Smart Naruto in fanfic is also creative. He invents new jutsus or modifies existing ones. He thinks outside the box, like using the environment in a battle in ways that others haven't considered. His intelligence allows him to see opportunities where others see only obstacles, and this makes him a formidable character in the fanfic world.
Well, 'naruto smart fanfic' could be about many things. It might be a fan - created story where Naruto is depicted as extremely intelligent. Maybe it shows him using his smarts to outwit his enemies in ways not shown in the original series, like coming up with really elaborate battle strategies or solving complex village - wide problems with his sharp mind.
It could be a rogue ninja who was secretly plotting against Naruto all along. After Naruto's death, this antagonist could emerge and try to take over the village, seeing it as the perfect opportunity with the village in mourning and a bit disorganized. This ninja might have some personal vendetta against Naruto and now wants to make the village pay.
You can find 'Naruto Shippuden Narusaku fanfic' on some popular fanfic websites like Fanfiction.net. There are a large number of Naruto - related fanfics on this site, and you can easily search for Narusaku ones. Another option is Archive of Our Own (AO3). It has a great collection of fanfics, and you can filter your search specifically for Narusaku fanfics within the Naruto Shippuden category.
Perhaps in the 'naruto dies narusaku fanfic', Naruto sacrifices himself to save Sakura from a powerful enemy. Sakura, in her despair, starts to discover new aspects of Naruto she never fully realized when he was alive. She could then start a journey to find a way to bring him back, encountering many challenges along the way and meeting old friends and foes who either help or hinder her.
One great 'Naruto Shippuden Narusaku fanfic' is 'A New Beginning'. It explores their relationship post - Shippuden in a very interesting way. The author delves deep into how Sakura and Naruto's feelings for each other develop further. Another one is 'Narusaku: The Unspoken Bond'. It shows their unspoken connection and how they support each other through different challenges.