Why doesn't Naruto know what a birthday is in fanfiction?

Maybe in the fanfiction, Naruto grew up in a very isolated or unloving environment, so he never experienced hugs.

Maybe because in the fanfiction, Naruto's upbringing and experiences didn't expose him to enough examples of love.

It could be that in Naruto's world, fanfiction isn't something that's common or known, so he's never been exposed to it and doesn't have the knowledge.

Well, there could be various reasons. Maybe the writer wants to create a unique situation where Naruto is silent to add mystery. For example, if the fanfiction is set in a scenario where Naruto has lost his voice due to a curse or some kind of magic. It could also be that the author is focusing on other characters' reactions to Naruto's silence, which can bring out different aspects of their personalities.

It's important because it maintains the integrity of his character within the original story. If he knew about fanfiction, it would be like breaking the fourth wall and would seem out of place for his character who is supposed to exist solely within the original narrative.

Maybe Naruto just sees Sakura as a friend. He might have a different idea of his ideal partner and Sakura doesn't fit that. His feelings for her could be purely platonic.

It could be that Natsu has been focused on other things, like adventure or magic, and hasn't had the opportunity to explore or experience love. Or perhaps there are emotional barriers within him that prevent him from grasping the concept.

One possible reason could be miscommunication. Maybe Kakashi has been involved in some secret missions or decisions that Naruto doesn't understand, leading to a breakdown in trust. For example, if Kakashi made a call during a battle that put Naruto or his friends in danger without fully explaining it to Naruto later.

One possible reason could be his past traumas. Naruto grew up alone and was often shunned by the villagers. Physical touch might remind him of the times when he was pushed away or bullied, so he has developed an aversion to it in fanfiction.

Well, in some fanfictions, it might be because the writer wants to create an alternative storyline. Maybe they think Naruto has a different type of relationship in mind, like a more platonic or brother - sister - like bond with Hinata instead of a romantic one.