Another possibility is a crossover with 'God of War'. Death and Kratos could meet. Given their both powerful and somewhat vengeful natures, they could either become bitter enemies or reluctant allies. The story could explore their different views on death, with Death being an embodiment of it and Kratos having a very personal and violent relationship with death in his own journey.
Another interesting concept for a Darksiders War crossover fanfiction could be a crossover with the Diablo series. Imagine the dark and gritty world of Diablo mixing with the post - apocalyptic world of Darksiders. The heroes from Darksiders could be lured into the world of Sanctuary in Diablo, where they have to deal with the hordes of demons while also trying to find a way back home.
One idea could be that the Horsemen from DarkSiders end up in the world of RWBY. Maybe War arrives first and is mistaken for a powerful Grimm. He then has to figure out how to interact with the Huntsmen and Huntresses while also trying to find a way back to his own realm. Another idea is that the characters from RWBY somehow stumble into the post - apocalyptic world of DarkSiders and have to adapt to the harsher and more dangerous environment.
There's a fanfiction where Death crosses over with the 'Warhammer' universe. It's really interesting as it shows how Death's character would interact with the various races and magic systems in Warhammer. His quest for balance in Darksiders 2 takes on a whole new meaning when he has to deal with the chaos and order of the Warhammer world. It also delves into how his scythe might compare to the weapons in Warhammer.
One idea could be that Naruto is somehow transported to the Darksiders universe. He might initially be confused by the dark and desolate landscape. But with his ninja skills and determination, he could start to explore and try to find a way back home. He could encounter the Horsemen and at first be seen as an enemy, but later they realize he has no malicious intent.
Another plot could involve a crossover within the Darksiders universe. Maybe the Horsemen have to team up with a previously unknown group of characters to face a new, greater threat. This could introduce new dynamics and relationships.
One idea could be a crossover where the characters from Naruto end up in the Darksiders universe and have to fight the demons there using their ninja skills. For example, Naruto could use his shadow clones to confuse the hordes of demons while Sasuke uses his Sharingan to predict their moves.
One idea could be creating an OC who is a hybrid of different races in the Darksiders universe. For example, a half - angel, half - demon character. This would bring a unique perspective as they struggle with their dual nature, being neither fully accepted by the angels nor the demons.
One idea could be a crossover between a classic superhero like Superman and a powerful anime character like Goku. Picture them in a battle where they have to adapt to each other's fighting styles. Another could be a crossover of characters from different horror universes, like Freddy Krueger and Pinhead, in a fight to the death in a nightmarish realm. And a third idea might be to cross a high - fantasy character like Gandalf with a modern - day action hero like John Wick. They could team up against a common enemy in a world that blends magic and modern weaponry.
Definitely Dante from 'Devil May Cry'. Dante is a stylish and powerful demon hunter. His acrobatic combat style and his cocky attitude would contrast well with Death's more stoic and purpose - bound personality. They could end up in a situation where they have to fight a common enemy that threatens both their worlds.
Perhaps the Avengers mistake one of the Horsemen for a new super - villain. As they engage in battle, they soon realize that the Horsemen is actually after a powerful artifact that a real villain in the Avengers' world has obtained. So they form an uneasy alliance to retrieve the artifact.