It depends. Some elements from the comics are incorporated into the MCU movies, but not everything is considered canon. The MCU has its own established continuity and storylines that may deviate from the comics in certain ways.
In many cases, it's up to the creators and the established lore. Usually, if it's explicitly stated within the franchise's framework or ties in seamlessly with the main storyline, it can be considered canon. But there are always exceptions and nuances.
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.
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.