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.
Perhaps in the fanfiction, the Phantom gets caught in a fire in his underground lair. He is trying to rescue some of his precious music sheets or a memento related to Christine when the flames overtake him. As he is a rather mysterious figure, his death in such a way would add to the overall mystery and drama of the story. It could also be a way for him to finally be free from his tortured existence.
One possible alternate ending could be that Twilight Sparkle uses her magic in a completely unexpected way to stop the wedding chaos and actually uncovers a plot that was much deeper than anyone thought, leading to a celebration of friendship rather than a wedding.
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.
In one alternate ending, Ariel might not choose to be with Prince Eric. Instead, she realizes that her true place is in the sea with her family and friends. So she gives up on the idea of becoming human permanently and returns to her mermaid form, ruling the underwater kingdom beside her father.
One possible alternate ending could be that Anakin Skywalker resists the dark side at the last moment. Instead of becoming Darth Vader, he uses his love for Padmé to find the strength within him to reject Palpatine's temptations. This would change the entire future of the Star Wars galaxy, as there would be no Vader to enforce the Emperor's will, and the Jedi Order might be able to be rebuilt more quickly.
One possible alternate ending could be that the heroes discover a way to reverse the damage caused by Timetagger without having to fight him directly. Maybe they find an ancient artifact that has the power to reset the time changes he made. This would lead to a peaceful resolution and the restoration of the original timeline.
One possible alternate ending could be that Jafar actually manages to outwit Aladdin in the final battle. Instead of Aladdin winning and getting the girl and the kingdom, Jafar takes over completely. He turns the kingdom into a dark and desolate place, with all the citizens living in fear. Aladdin is banished to the desert, and Jasmine is forced to be Jafar's prisoner. This would be a much darker and unexpected ending compared to the original.
It could be about the Phantom in the world of My Little Pony. Maybe he falls in love with a pony character, and his dark and mysterious nature creates all kinds of drama and conflict within the pony world.
One possible alternate ending could be that Iron Man and Captain America come to a truce much earlier. They realize that the real enemy is the outside force that has been manipulating them all along. So, instead of fighting each other, they join forces and expose the true villain, leading to a united Avengers once again.
Another alternate ending could be that there is a big battle between the living and the dead. Victor manages to broker a peace treaty between the two worlds. As part of this, the Corpse Bride is given a special place in the living world. She becomes a sort of guardian between the two realms, and Victor stays with her as her companion, and they both ensure that the living and the dead co - exist peacefully.