The Terror of Hallow's Eve has no basis in reality. It's a made-up tale designed to give you chills and thrills during the Halloween season. The story and its elements are all from the creative minds of the writers, not real life.
Well, a great Sleep Hallow fan fiction idea could be a time - travel story. Suppose a character from the present day Sleep Hallow accidentally travels back in time to when the Sleep Hallow was first created. They could witness the origin of the mysteries and curses, and their presence might even change the course of events. Or you could write a fan fiction where the Sleep Hallow is invaded by an outside force, and the characters have to team up with their former enemies to defend it. This would bring out new dynamics and alliances among the characters.
Overall, D Gray Man Hallow adheres pretty closely to the manga. Some scenes might be presented differently for better animation effects, but the core story remains intact.
First, get to know the Sleep Hallow world really well. Watch any related shows or read any books. Then, pick a character or a concept that interests you the most. For example, if you like a certain villain, you could start by thinking about their motives from a different perspective. Next, come up with a simple plot idea, like a quest or a mystery to solve. After that, just start writing. Don't worry too much about grammar or making it perfect at first.
Power dynamics is often a theme. Naruko is known for her strong ninja abilities and Ichigo has her own set of formidable powers. In the fanfiction, they might compete, cooperate or even teach each other new ways to use their powers. Also, self - discovery can be a theme as they learn more about themselves through their interactions with someone so different from their own world.
One common theme is the power combination. Since both Naruto and Ichigo are powerful in their own universes, in these crossovers, their powers might be combined in interesting ways. Another theme could be friendship or rivalry. They could start as rivals due to their different backgrounds and powers, and then develop a friendship. And sometimes, there's the theme of saving the combined universe they find themselves in, which is a mix of Naruto's and Ichigo's worlds.
One idea could be to have characters from 'D Gray - Man' interact with characters from another series in a post - apocalyptic setting. For example, they could team up to fight against a new type of Akuma that has emerged due to the crossover's unique circumstances.
First, you need to decide which other series or world you want to crossover with. Then, research both 'D Gray - Man Hallow' and the other one thoroughly. This includes understanding the characters, their powers, and the overall lore. After that, come up with a basic plot idea, like a common threat that forces the characters from both to interact.
I haven't really come across much 'hallow naruko x fem ichigo fanfiction'. But if you join relevant fan communities on social media platforms, other fans might be able to recommend some great ones to you.