Makima's fate in the manga is quite complex and involves a series of dramatic events. She faces powerful opponents and has her own agenda that leads to significant developments.
Well, Makima's death in the manga is the result of a series of events and confrontations. It's not straightforward and is tied to various character interactions and plot twists.
One popular trope is the 'What If' scenario. For example, what if Maui didn't leave Moana at some point in their journey? Another is the 'Hidden Relationship' trope, like Moana having a secret connection to another character from her island's past. And the 'Character Development Expansion' is also common, where a writer delves deeper into Maui's backstory, perhaps exploring his early days as a demigod and how he became the Maui we know in the movie. Fanfictions often play with these ideas to create new and interesting stories within the Moana universe.
Moana is indeed an original story. The filmmakers came up with the concept and characters from scratch to bring a unique and engaging narrative to the screen. There are no direct ties to any previously existing tales.