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.
The exploration of power and morality is often seen. In a war - torn setting, decisions about using power and what is morally right or wrong become crucial. Uriel might struggle with these concepts, and fanfiction writers could delve into how he makes these difficult choices, whether it's about using his own powers for good or not succumbing to the dark side when faced with tough situations.
One possible fanfiction could be about War and Uriel teaming up to face a new, unknown threat in the Darksiders universe. Maybe a powerful demon that has emerged from a previously sealed realm, and they have to combine their unique abilities to defeat it.
Perhaps there is a dark force corrupting the angels, and Uriel is suspected of being influenced. War is sent to investigate. As he gets closer to Uriel, he realizes she is innocent but they must work together to find the true source of the corruption and stop it before it spreads throughout the entire angelic realm. This would involve a lot of action and tense moments as they fight against both the corrupted angels and the real threat behind it.
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.
In a War and Uriel romance fanfiction, the element of forbidden love could be significant. Their different allegiances, War being part of the apocalyptic forces and Uriel an angel, make their relationship something that would be frowned upon by many in their respective worlds. This can lead to secrecy and the added excitement of being discovered. Their shared experiences in battles and facing common enemies is also crucial. These shared moments of danger and survival can strengthen their bond, as they rely on each other's skills and abilities. And finally, the exploration of their individual backstories, how they became who they are, can give depth to their relationship as they understand each other better through these revelations.
You can try some popular fanfiction websites like Archive of Our Own (AO3). It has a large collection of various fanfictions, and you might be able to find some great 'War and Uriel' ones there. Just use the search function on the site.
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.
Friendship and camaraderie are also common themes. In the harsh environment of the war theatre, the bond between soldiers is often a key element. They support each other, save each other's lives. Loss is another theme. The death of comrades or civilians in the war is often depicted, which adds to the emotional depth of the stories. In some fanfictions, a character's journey to deal with the loss of a close friend is the central plot.
One common theme is the struggle for power. Each zodiac character often has their own power or ability, and they fight over who gets to dominate or protect. Another theme is friendship and betrayal. Since they are in a war, some may turn on their allies for personal gain.
Power struggles are a common theme. The witches are often fighting over different sources of power, like magic artifacts or new spells. Another theme is loyalty. They have to decide which side to be on in the war, and loyalty to their coven or to their ideals can be a big factor.
The concept of power and its abuse is also prevalent. There are often powerful entities in these stories who try to use the chaos of the multiverse war to gain more power or control. This can lead to some interesting moral dilemmas for the characters.