If the Phantom is accepted by the public in an alternate ending, it would change the message to be about acceptance and the ability of society to look past physical differences. It would suggest that talent and a good heart can overcome prejudice, and that everyone has the potential to be part of a community if given the chance.
If the alternate ending is more positive, like the characters achieving victory over the bad guys, it can change the message from one of despair in the face of overwhelming odds to one of hope and the power of unity. It shows that even in the darkest of times, people can come together and make a difference.
If the alternate ending is more positive, like Carrie using her powers for good, it can change the message from one of despair and the consequences of bullying to one of hope and redemption. It shows that even those who have been deeply wronged can rise above it and use their 'curse' as a 'blessing'.
In the case of 'Snow White', the original has a message about good triumphing over evil. But an alternate ending where the queen reforms herself and Snow White forgives her changes the message. It now emphasizes the power of forgiveness and redemption. It makes the story less about a simple battle between good and evil and more about the possibility of change and growth in people, even those who seem irredeemable at first.
In the case of a new time - controlling hero emerging, it would introduce a whole new element to the story. The story would no longer be just about the existing heroes and Timetagger. It would expand the Miraculous universe by showing that there are other powerful forces out there. The new hero could bring new powers, new rules, and new storylines that could potentially lead to spin - offs or new arcs in the Miraculous franchise.
In a different take for an alternate ending, the Phantom could expose his face to the public in a grand gesture. He shows that despite his disfigurement, he is a man of great talent and feeling. The public, moved by his music and his courage, accepts him. Christine then falls in love with the new - confident and accepted - Phantom, and they build a life together where the Phantom becomes a respected figure in the Parisian art scene.
If the alternate ending was a happy one where everyone was cured, the overall tone would change from dark and apocalyptic to hopeful and optimistic. It would be a complete shift from the sense of doom that pervades the original story.
In some fanfictions, if Harry doesn't defeat Voldemort through violence but rather through peaceful means like negotiation or magic - sharing, the theme of 'power through love and sacrifice' can change to 'power through understanding and unity'.
The ending is crucial to the overall message. In 'The Nun's Story', the whole plot builds up to her decision at the end. The message throughout the story is about the struggle between religious dogma and personal beliefs. The ending, with her leaving the convent, emphasizes that individuals have the right to define their own spiritual paths. It shows that the strictures of the convent were not working for her, and this in turn sends a message that one should follow what feels right in their heart, even in a religious context.
This alternate plot would turn the story on its head. Bellatrix's loyalty to Voldemort could put Harry in a difficult position. He might be forced to choose between his mother's side and the side of good. The relationship with Sirius would be extremely different too. Instead of being his godfather, Sirius might be an enemy. And the final battle against Voldemort would have different implications as Harry's connection to both Voldemort and Bellatrix would be a major factor.
The monologue might provide a final thought on the significance of Christmas in the context of the story. For instance, if the story was about a person going through a tough time, the monologue could show how Christmas brought them out of it. It might say something like 'Christmas was the light in the darkness, the hope that made everything better.'