Perhaps an alternate ending could involve the magic carpet. The carpet could be revealed to have its own consciousness and a greater power. In the final showdown, instead of Aladdin using the lamp, the magic carpet sacrifices itself to defeat Jafar. This leaves Aladdin and Jasmine heartbroken, but they use this as a motivation to make the kingdom a better place in memory of the carpet. They also make sure to honor the Genie and all the magical beings in their new, more harmonious kingdom.
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.
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.
In an alternate ending in fanfic, the spell could have been broken in a different way. What if instead of Belle's declaration of love, it was the Beast's selfless act towards the villagers that broke the spell? For example, when the villagers come to attack the castle in fear, the Beast could have chosen not to fight back and instead protect them from some other danger. This act of kindness and selflessness could have been the key to breaking the spell, and he turns back into a prince. Belle then realizes she has fallen in love with him not just for his new form but for his noble heart.
An interesting idea could be that the Genie accidentally grants a wrong wish. Let's say Aladdin wishes for something to help him defeat Jafar, but due to a miscommunication, it backfires. This leads to a situation where Aladdin has to find a way to reverse the effects of the wrong wish and still defeat Jafar. It could add a lot of comical and tense moments to the story. For example, he might be turned into a small animal for a while and has to rely on his wits and the help of his friends in this new form.
One possible scenario could be that Doctor Strange saw a different future where they managed to stop Thanos before he got all the Infinity Stones. So, the Avengers might have worked together more effectively from the start. For example, they could have sent a team to intercept Thanos on his way to collect the stones on different planets.
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.
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.
Themes in 'angel beats alternate ending fanfic' can vary widely. There could be a theme of second chances. Characters might get another opportunity to correct their mistakes or fulfill their unfulfilled wishes. Also, the theme of friendship can be explored more deeply. Maybe characters who were on the verge of losing their friendship in the original get a chance to strengthen it in the fanfic. Additionally, the theme of self - discovery is also common, as characters might learn more about themselves in the new ending.