The theme of facing a common enemy also pops up often. Let's say in an Aladdin and Hercules crossover. There could be a powerful villain that threatens both their worlds. So they have to combine their strengths, Aladdin's wits and the magic of the lamp with Hercules' strength, to defeat this enemy. This theme of cooperation in the face of danger is a staple in many Aladdin crossover fanfictions.
Love is a very common theme. Fanfictions often explore the deepening of Aladdin and Jasmine's love, how they support each other through difficulties. For example, in many stories, Aladdin's street - smart ways help Jasmine deal with political intrigues in the palace.
One common theme is redemption. Many fanfictions explore whether Jafar can be redeemed after all his evil deeds, and how Aladdin might play a part in that. Another is power dynamics. Given Jafar's thirst for power and Aladdin's more humble origins, their relationship in terms of power is often explored.
Love is a very common theme. Their relationship is central in the original story, and in fanfiction, it's often explored more deeply, like showing how they overcome obstacles to be together.
A common theme is empowerment. The female genie is often depicted as a strong character, using her powers to make positive changes in the world of Aladdin. For instance, she might use her magic to help the poor or to stand up against unjust rulers.
Another theme is the overcoming of differences. Aladdin is from a poor background while Jasmine is a princess. Fanfictions might focus on how they bridge this gap in society and culture in their relationship. It could show how their love helps them to see beyond these differences and create a more equal and loving relationship.
The theme of temptation also appears. Jafar might try to tempt Aladdin to the dark side, or Aladdin might be tempted to use Jafar's power for his own good. This creates a lot of interesting conflict and character development in the fanfictions.
One common theme is adventure. Since Aladdin is known for his adventures in the original story, it's often carried over into the fanfiction. The reader gets to go on exciting escapades with him in the streets of Agrabah or in the magical caves.
Power struggle is a common theme. Since Jafar is always after power in the original story, OCs often get involved in this struggle, either trying to stop him or being tempted by power themselves.
One common theme is power dynamics. Jafar is a powerful sorcerer and the reader is often in a position where they are either at his mercy or trying to gain some power over him. Another theme is the allure of the forbidden. Jafar is a villain, so being involved with him is something that is not considered proper in the context of the original story.
Another theme could be the role of a female Aladdin in the grand scheme of the Magi world. How would her being female change the prophecies, the battles, and the overall power balance? Some fanfictions might focus on her journey to discover her true power and purpose in this altered scenario.