In some fanfictions, when Woody reveals himself to Andy, it could be a very emotional reunion. Maybe Woody has been lost or on an adventure far away, and his return brings back all the great memories they had together. Andy might be overjoyed to see his old friend again and they could start a new adventure right in their own backyard.
In fanfiction, when Harry Potter reveals himself, it could be a moment of great drama. Maybe he reveals his true identity to save his friends from a dangerous enemy. For example, if they are being tricked by a Death Eater in disguise, Harry might step forward and expose himself to stop the harm.
The Joker might be furious. His identity has been his biggest secret and Batman taking that away is like stripping him of his power. He could go on a wild rampage, more so than usual, targeting Batman directly and also anyone who he thinks might have had a part in the revelation.
In fanfiction, Naruto sacrificing himself for Obito could be a very emotional and dramatic concept. It might show Naruto's ultimate selflessness, believing that Obito is worth saving at the cost of his own life. This could be due to Naruto seeing the good in Obito that others might not, like the part of Obito that was once a kind - hearted shinobi.
One common scenario could be Percy revealing his true identity to save his friends. For example, in some fanfictions, his friends might be in danger because of a misunderstanding about him. So, he reveals himself as a powerful or special being to clear the air and protect them.
The story would take a very dark turn. Naruto is a central figure, and his loss would be deeply felt. Obito might feel an overwhelming sense of guilt. He could potentially turn his life around completely to honor Naruto's sacrifice, perhaps becoming a force for good in a way he hadn't been before.
Kakashi could be involved too. Given that Kakashi has trained Naruto and seen his growth, Naruto might trust him with his secrets. He could reveal his thoughts on how he wants to change the ninja world for the better and the steps he is planning to take in the future.
In such a situation, you could either pretend you didn't hear it and carry on with the story, or have a lighthearted chat with the person about the importance of not spoiling endings for others.
As a fan of web novels, I don't have the latest information about iPartment 4. However, according to my knowledge, iPartment 4 is a TV series, and the plot has not been publicly announced yet. If I have more information, I will try my best to answer your questions.