ORV is classified as a manhwa. It has managed to create a devoted fan base due to its combination of exciting narrative and visually appealing graphics.
To write a good Uriel character, first understand her basic traits from the Darksiders source material. She is a strong and fearless warrior. So, in fanfiction, keep her combat skills and determination at the forefront. For example, when facing an enemy, she should be decisive and act quickly.
ORV is a novel. It has a rich and elaborate narrative that is characteristic of the novel genre. There might be plans or fan-made webtoon versions, but the original and official form is a novel.
One common theme is probably heroism. Given the 'War' aspect, the characters, including Uriel, might be depicted as heroic figures facing great challenges. For example, they could be saving a world or a group of people from destruction.
One possible scenario in such a fanfiction could be that War and Uriel start off as reluctant allies. War, being the Horseman, is initially focused on his own mission. But as they face various challenges together, they begin to notice the strength and determination in each other. Uriel is impressed by War's unwavering resolve, and War starts to see Uriel's more compassionate side beneath her tough exterior. Their relationship could develop gradually, with small moments of shared understanding and mutual respect, eventually leading to a deep romantic connection.
I'm not entirely sure as 'orv' could stand for many things. It might be a very specific or niche online novel. Maybe it's about a unique fictional world, with interesting characters and a complex plot.