It could be Hermione. She is always so smart and observant. She might have stumbled upon some hidden information and decided it was time for Harry to know the truth.
Maybe an old wizard or witch from a far - flung corner of the wizarding world comes to Harry. This character could have been in hiding or just out of the main events of the wizarding world but has some crucial knowledge about Harry's past or his destiny. They might be the one to break the news and change Harry's understanding of his world completely.
Another truth could be related to the wizarding world's history. Harry might learn that there are secrets about the founding of Hogwarts that have been kept from him. For example, he could discover that one of the founders had a connection to a powerful magical artifact that is now lost. This knowledge would change his perspective on the school he loves and his place in the wizarding world.
Well, in such a fanfiction, Harry might learn some hidden secrets about his family. Maybe he discovers some long - lost relatives or some dark secrets about his parents that were previously unknown.
Perhaps Harry discovers that Snape had a much deeper connection to his mother than he initially thought. Snape's love for Lily Potter could be explored in more detail, showing that his actions towards Harry were influenced by his feelings for Lily. This could involve Snape secretly protecting Harry in ways that were not obvious in the original story.
He could be shocked at first. Imagine finding out that your whole life has been based on half - truths. He might need some time alone to process it all.
Obviously Naruto is one of the main characters since it's about him learning the truth. Sasuke could also be a main character as Naruto's relationship with Sasuke is often intertwined with the truth he's about to discover. Kakashi might be involved too, as he has a lot of knowledge about the past and could be the one to guide Naruto in his search for the truth.
At first, Harry probably sees Snape as a cruel and unfair teacher. But as he learns the truth, he starts to view Snape as a hero. He realizes that Snape was on his side all along, despite the way he treated him.
The 'Truth' could be an ancient sage. These sages in the Naruto universe are often associated with great knowledge and wisdom. An ancient sage as the personification of Truth could impart some long - lost knowledge to Naruto, something that could change the course of his life and the future of the ninja world.
Hermione Granger might also be a main character. She is an important part of the original series and her intelligence and knowledge would be useful in uncovering any truths in this fanfiction. Also, Ron Weasley could be there as Harry's loyal friend, and together they could face the challenges related to the 'truth' in the story.
It could be that Dumbledore plays a more prominent role in this fanfiction. Since it's about 'the truth', perhaps Dumbledore has some secrets that are finally revealed, and he becomes a central figure in guiding Harry towards understanding. Additionally, some minor characters from the original series might be elevated to main characters if they hold key pieces of the truth.
It could be about a character in the Harry Potter universe taking an oath of truth that leads to various revelations. For example, a student might take this oath and then be forced to disclose secrets about a hidden magical artifact on the Hogwarts grounds. This could then set off a chain of events where other students and teachers get involved in the search for the artifact and the understanding of its power.