It's highly unlikely. Naruto's world is preoccupied with real - life ninja stuff. Fanfiction and AMVs are products of our modern - day, media - savvy world. There are no computers or the Internet in Naruto's world for him to access such fan - made content.
He might be amazed. Naruto is used to his own world and seeing a fan - made interpretation like an AMV fanfiction would be like seeing a new side of his story.
Well, Naruto might be really confused at first. He's from his own world and an AMV (Anime Music Video) fanfiction is a very modern and fan - created concept. He could be intrigued by the different interpretations of his story or his friends' stories in the fanfiction.
Well, in some fanfiction ideas, Naruto might use some powerful jutsu. For example, he could discover a new form of the shadow clone jutsu that allows him to transfer life force. He clones himself multiple times and combines their life energy to bring Haku back. Another way could be through some kind of ancient forbidden jutsu he stumbles upon. Maybe it's a jutsu that requires a great sacrifice on his part, like giving up some of his own chakra permanently.
I'm not sure if there's a specific and widely - known 'Naruto x Haku pregnant fanfiction'. But it's very likely to exist given the creativity of fanfiction writers. They often take existing characters and put them in unexpected situations. A story about Haku being pregnant could involve all kinds of new plotlines, like dealing with the reactions of other characters in the Naruto world, or how Haku would handle the physical and emotional changes. It might also be a way to introduce new elements to the Naruto universe that were not present in the original series.
One consequence could be that Naruto is seen as a hero by some, but also as a rule - breaker by others. The ninja world has rules about bringing back the dead, and Naruto's actions might stir up controversy. Some might fear that this new ability of his could be misused. Haku, on the other hand, would have to adjust to a world that has changed since his death. He might face challenges in reconnecting with his old friends or finding his place in the new ninja world.
One idea could be a 'what if' story. What if Haku survived? They could team up with Naruto to take on new threats in the ninja world. Naruto's positive influence might change Haku's view on life even more.
Naruto would probably give Haku training on chakra control. Since Naruto has had to work hard on his own chakra control, he'd be able to pass on some useful tips. For example, he could teach Haku how to better focus his chakra for more precise attacks.
A good way to develop their relationship is through shared experiences. They could go on a mission together where they face a powerful enemy. In the face of danger, they rely on each other. Naruto's optimism can lift Haku's spirits, and Haku's calmness can keep Naruto focused. This mutual reliance during tough times can transform their relationship from acquaintances to friends.
It could also be a result of a unique encounter with a powerful entity. For instance, if Naruto entered a mysterious realm where the essence of Haku's bloodline was stored, and some sort of transference occurred, perhaps due to Naruto's own unique chakra nature. This could lead to him obtaining Haku's bloodline.