In general, the status of Naruto novels as canon can be a bit ambiguous. Some are closely tied to the main plot and characters, while others might be more like side stories or expansions that don't have a major impact on the core storyline.
It could be the First Hokage, Hashirama. Naruto would be amazed by his powerful Wood - Style jutsu and his ability to create the village. He could learn about the original ideals behind the Hidden Leaf from Hashirama.
Definitely not. In the Naruto series, we see Naruto's development as a ninja, his relationships with Sasuke, Sakura, Kakashi and others are based on mutual respect, friendship and the pursuit of common goals. This fanfiction idea is not only non - canon but also goes against the positive and family - friendly nature of the Naruto franchise.
Definitely not. The Naruto canon is based on ninja battles, friendship, and the pursuit of peace. The idea of Itachi getting Naruto pregnant has no basis in the original story's themes, character relationships, or the world - building that has been done. It's a fan - created concept that goes against the grain of the canon.
In a fanfiction, we could explore a story where Kushina survives the Nine - Tails attack. She then gets to be a part of Naruto's growth, teaching him about his Uzumaki heritage and how to control the Nine - Tails in a more personal way compared to what Jiraiya taught him.
It has a significant impact on the Naruto canon. In the original Naruto canon, there are no such storylines. If there is fanfiction about Naruto getting someone pregnant, it completely changes the character's path and the overall story direction. It's like adding a whole new and unexpected chapter that doesn't fit with the established lore. For example, Naruto's main focus in the canon was on becoming Hokage and bringing peace to the village. This new plot would divert his attention and character development in a very different way.