One interesting fanfiction could be where the main characters from different time periods in the movie gather to watch the events of the trilogy unfold as if it were a movie. They might comment on how accurately or inaccurately their own actions were depicted.
Often, they are surprised. For example, if Marty watches the movies, he might be amazed at how his adventures were portrayed. He could laugh at some of the inaccuracies or be proud of how cool he looks on - screen.
There is a fanfiction called 'Naruto: Future Reckoning'. It focuses on how the past actions of the characters start to have unforeseen consequences in the future. It's a really thought - provoking read. 'Naruto: Future Frontiers' is another good one. It imagines new types of jutsu and abilities that the ninjas develop in the future to face new challenges. And 'Naruto: The Future Unveiled' explores how the mystery of the Otsutsuki clan might be fully revealed in the future and how it would impact the ninja world.
One popular 'Back to the Future' rated M fanfiction could be those that explore the darker, more complex relationships between the characters. For example, some might focus on the strained relationship between Marty and Doc in an alternate timeline where things have gone very wrong. However, it's important to note that rated M often implies mature themes such as intense violence or complex moral situations, which might not be suitable for all audiences.
There are fanfictions that go back to the origin of the Nine - Tailed Fox's presence in the village. It might explore how it was sealed initially and the events that led to it being in Konoha. Such a fanfiction can be really exciting as it dives deep into one of the most important aspects of the Naruto story.
The specific information about the characters of Return to the Future 1999 was not clear. The search results mentioned the names and attributes of some characters, but there was no detailed introduction or evaluation of these characters. Therefore, based on the information provided, it was impossible to accurately answer the question about the characters who returned to the future in 1999.
Another great Kakashi back in time fanfiction idea is him going back to the time right before Obito's 'death'. He could then change the events that led to Obito's fall to the dark side. This would rewrite the entire future for the Ninja world, as Obito played such a crucial role in many of the later events, including the Fourth Ninja War.
One interesting Snape back in time fanfiction is 'Snape's Time - Turned Adventure'. In this story, Snape goes back to his Hogwarts days with new knowledge and tries to change some of the events that led to his difficult life. Another is 'Back to the Past: Snape's Redemption' where he has the chance to right the wrongs he did in the past, especially regarding his relationship with Lily.
In a crossover with 'The Matrix', Neo would be an interesting addition. He could use his skills in the virtual world to help Marty and Doc Brown understand and manipulate the digital aspects of time - travel technology that might be affected by the Matrix. His ability to see the code could potentially help them fix glitches in the DeLorean's time circuits.
One interesting concept could be exploring different time periods that the characters didn't visit in the original movies. For example, what if Marty went back to the Middle Ages? Another could be alternate endings, like if Doc Brown had never invented the time machine. And some fan fictions might focus on the relationships between the characters in new and unexpected ways.
One idea could be a crossover with 'Doctor Who'. The TARDIS could land in Hill Valley, and the Doctor could team up with Marty McFly. They could use the time - traveling capabilities of both the DeLorean and the TARDIS to fix some major time - related disasters across different universes.