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.
Perhaps in an alternate ending, the villain of the story could have a change of heart at the last minute. For example, if it was a character trying to stop the wedding for their own gain, they might see the love between the couple and decide to help instead. This would completely change the tone of the ending from a potential disaster to a happy union with an unexpected ally.
Twilight Sparkle would likely be affected as she is often at the center of things in the MLP universe. Her actions and decisions would be crucial in any alternate ending, whether she's saving the day or facing new challenges.
One alternate ending might involve a twist where a previously minor character plays a crucial role in resolving the story. Another could have a happier resolution for all the characters, contrary to the original's tone.
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.
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.
One alternate ending could be that the main character decides to give up their quest and live a simple life instead. This could completely change the tone of the story.
Another view could be that the alternate ending is a way for fans to explore different narrative paths. It could be a way to satisfy those who felt that the original ending was too sad or left some loose ends. It might introduce new plot elements, like new characters who play a significant role in changing the outcome for Hazel and Gus. It could also be a means to explore different themes, such as the power of love in a more positive light, rather than the bittersweet way it was presented in the original.
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.
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.