One idea could be a crossover where the magic from Harry Potter is introduced into the world of Guilty Crown. For example, a Hogwarts student somehow ends up in the Guilty Crown universe and uses magic to combat the threats there. They could teach some of the characters basic spells like Lumos to help them in the dark environments.
The power of friendship is a strong theme in Harry Potter. In Guilty Crown, the relationships between characters also play a crucial role. A fanfiction could blend these by having the friendships in Harry Potter help strengthen the bonds between characters in Guilty Crown during a difficult time. For example, Hermione's intelligence and loyalty could help the characters in Guilty Crown come up with better strategies.
When writing a Guilty Crown time travel fanfiction, it's important to do research on the original series. Know the world - building, the powers, and the relationships. Then, plan your plot. You could start with a small event that triggers the time travel. For instance, a malfunctioning Void Genome. Then, as you write, focus on how the character's actions in the past affect the future of the Guilty Crown world. This can create a lot of interesting twists and turns in the story.
In the realm of Guilty Crown Shu and Mana fanfiction, there are also stories that might focus on their powers. How would their abilities interact in new and unexpected ways? This can lead to really creative and engaging plots, as fans use their knowledge of the Guilty Crown universe to build unique stories around these two characters.
A really creative one is 'Guilty Crown Elements in Naruto's World'. It imagines what would happen if the technology and power concepts from Guilty Crown were introduced into the Naruto universe. It has some amazing battle scenes where Naruto and his friends face new threats with a blend of both worlds' powers.
Maybe Harry accidentally cast a spell on Hermione during a training session that caused her some harm. So he feels guilty because he didn't mean to hurt his friend.
One great Guilty Crown time travel fanfiction is 'A New Beginning'. It takes the characters back in time and explores how they could change the course of events. The story is really engaging as it shows the characters' growth and how they adapt to the new time period.
I'm not sure if there is such a specific fanfiction. Fanfiction can cover a wide range of scenarios, but not all of them are easy to find. You could try searching on some major fanfiction platforms like Archive of Our Own or FanFiction.net to see if it exists.
The unique bond between Shu and Mana in the original Guilty Crown provides a rich basis for fanfiction. Their relationship was full of twists and turns, and fanfiction can further explore those dynamics.
In fanfiction, the relationship between Shu and Ayase can be quite diverse. Sometimes, they might be portrayed as close friends who support each other through the tough times in the Guilty Crown world. Ayase could be the one who encourages Shu to be stronger and face his responsibilities.