One possible theme could be the struggle between man and nature. Izayoi Sakamaki represents humanity, and the water god represents a powerful force of nature. Their fight shows the human will to overcome natural forces.
I'm sorry, I haven't actually read this specific novel. But generally, a fight between a character like Izayoi Sakamaki and a water god would likely involve a lot of action. Maybe Izayoi has some special powers or skills that he uses against the water god's aquatic - based abilities.
The plot in izayoi sakamaki light novels is usually complex. There are often multiple storylines intertwined, like in a mystery where different clues and events gradually come together to form a bigger picture. For example, there might be a main plot about a magical quest, but also sub - plots about the characters' personal growth and relationships. This makes the story rich and engaging.
Well, 'Sword Art Online' could also be considered in a way. It has a complex and engaging story. The main character is trapped in a virtual world, and there are many challenges and relationships that develop, much like what might be found in an izayoi sakamaki light novel.
One common theme is adventure. Given their nature in the original work, fanfictions often send them on new and exciting adventures together. Another theme could be friendship development, exploring how their relationship grows and deepens over time.
You can try fanfiction websites like Archive of Our Own (AO3). It has a large collection of fanfictions from various fandoms, and there's a good chance you'll find some great Izayoi Sakamaki and Black Rabbit fanfictions there. Another option could be FanFiction.net, although the quality can be a bit more variable.
I recommend 'Demon Slayer' to you. This book is an oriental fantasy novel written by the great poet of Mount Yuayu. It tells the story of a world where water and fire fight and bloodshed occurs. The Water God Gonggong and the Fire God Zhurong also appear in it. I hope you like this fairy's recommendation. Muah ~š
Love is a main theme. The relationship between the bride and the water god likely involves different forms of love, whether it's initial attraction or a deeper, more complex form of love that develops over time.
The water god and his bride are the main characters for sure. There might also be other gods or goddesses related to the water god, like his siblings or rivals in the divine realm.