Yes, it is very likely to be a fantasy genre. Fantasy novels often feature supernatural elements like goddesses, magic, and otherworldly settings. The 'first end' part could also be related to some sort of magical or otherworldly event which is typical for the fantasy genre.
It could be about a love story between a mortal and a goddess. Maybe the mortal somehow encounters the goddess and they go through various adventures together, and in the end, they might have a happy ending or a bittersweet one.
You can start by looking on fanfiction websites like FanFiction.net or Archive of Our Own. These platforms usually have a wide variety of fanfictions related to different series, including 'Oh My Goddess!'. Just use the search function and type in 'Oh My Goddess Keiichi and Dark Urd' to see what's available.
There are quite a few interesting ones. Some might focus on unique crossovers between the Naruto world and the Oh My Goddess universe. For example, a fanfiction could explore how the characters from Naruto interact with the goddesses in the Oh My Goddess world, perhaps in a joint adventure to save both their realms from a common threat.
The appeal also lies in the fact that it can attract fans from both the 'oh my goddess' fandom and the other fandom involved in the crossover. It's like a meeting point for different fan communities. Fans get to see how the unique aspects of 'oh my goddess', such as the goddesses' powers and the mythology in the series, can be integrated with the elements of another series. This can lead to some really creative and unexpected plot twists and character developments.
Well, Archive of Our Own (AO3) is also a great place to find 'oh my goddess crossover fanfiction'. It has a wide range of works. You might find crossovers with other popular series like 'Sailor Moon' or 'Fate/stay night' there. Some of these crossovers offer unique takes on the 'oh my goddess' universe by combining it with different story elements and characters from other franchises.
When writing a 'Naruto Oh My Goddess' fanfiction, start with a strong concept. Maybe it's a time - travel story where a Naruto character goes to the Oh My Goddess world in the past. Research is key. Look at other fanfictions for inspiration, but make sure your story is unique. Develop your characters well, especially if you introduce new ones. And most importantly, have fun with it. Fanfiction is a creative outlet, so let your imagination run wild.
One common theme could be their complex relationship. Since they are different characters with their own personalities, exploring how they interact and influence each other is often seen. Another theme might be their roles in the 'Oh My Goddess' universe and how their relationship affects the overall story or events in the fan - created scenarios.
One idea could be a story where the goddesses from 'Oh My Goddess' visit the Naruto world. They could use their divine powers to help Naruto and his friends in a difficult battle, like against a new and powerful enemy. Maybe the goddesses' magic could be the key to unlocking a new form of chakra for Naruto.
Harry Potter himself is also a common focus. His role as the hero in his own world could lead to some interesting scenarios when he meets the goddesses. Maybe he has to learn to work with them to save both the wizarding world and the world of the goddesses. Also, Belldandy from Oh My Goddess might be a popular character in these crossovers. Her kind and gentle nature could contrast with the more often - serious wizards in Harry Potter, and she could bring a new perspective to the story.