Well, one idea for the plot of such a crossover fanfiction could be that the Doom Slayer gets transported to the world of Wolfenstein. He then has to figure out how to deal with the different type of enemies there, the Nazis. Meanwhile, the Wolfenstein hero could be intrigued by the Doom Slayer's advanced weaponry and otherworldly strength. They might start off as cautious allies, but as they face more and more challenges together, they form a strong bond and a united front against the combined evils of demons and Nazis.
It could be a new entity that combines the worst aspects of both universes. For example, a Nazi scientist who has managed to merge demonic powers with his own dark experiments. This character would be extremely powerful, having the strategic and technological knowledge of the Nazis along with the raw, otherworldly power of the demons.
One possible plot could be that the Doom Slayer is somehow transported to the world of Goblin Slayer. He then teams up with Goblin Slayer to take on an especially powerful horde of goblins that have been corrupted by demonic forces from Doom. Their combined skills in combat, the Doom Slayer's superhuman strength and arsenal, and Goblin Slayer's knowledge of goblin tactics would make for an epic battle.
Well, one possible plot could be that Doom Slayer somehow gets transported to the Fairy Tail universe. He might initially be seen as a threat due to his intimidating appearance and his violent ways of dealing with enemies. But then, as the Fairy Tail members get to know him, they realize he's fighting against a greater evil. They could team up to take on a powerful dark wizard who has made a pact with demons similar to those Doom Slayer fights. The contrast between the magic - based world of Fairy Tail and the high - tech, gore - filled world of Doom would make for an interesting story.
In a Doom and Wolfenstein crossover fanfiction, it could be that there is a portal that opens between the two worlds. The demons start pouring into the Wolfenstein world, and BJ has to reach out to the Doom Slayer for help. The Doom Slayer brings his arsenal of powerful weapons, and together they train the resistance fighters in Wolfenstein to use these weapons. They also discover that some of the Nazi technology can be modified to be more effective against the demons, creating a unique blend of combat strategies from both universes.
In a 'doom slayer in another world fanfiction', perhaps the Doom Slayer is transported to a post - apocalyptic world different from his own. Here, he has to adapt his fighting style to new threats. He could discover new ways to upgrade his weapons using the resources of this strange world. Maybe he even has to face a new kind of demon that has evolved in this different environment.
There could be a cultural clash. The Doom Slayer comes from a more futuristic and hellish setting, while the Goblin Slayer is in a medieval - ish fantasy world. Their ways of communicating and understanding the world are different. However, this could also lead to some interesting exchanges. For example, the Goblin Slayer might be fascinated by the Doom Slayer's energy - based weapons, and the Doom Slayer could be intrigued by the magic and alchemy in the Goblin Slayer's world.
One interesting aspect could be the contrast in their fighting styles. The Goblin Slayer is more methodical and strategic when dealing with goblins, using his knowledge of their habits. The Doom Slayer, on the other hand, is a force of pure destruction. In a crossover, perhaps they could learn from each other. The Goblin Slayer could pick up some of the Doom Slayer's more aggressive tactics, while the Doom Slayer might gain some strategic thinking from the Goblin Slayer.
One great Doom Slayer crossover fanfiction is the one where he crosses over with the Halo universe. It's exciting to see the Doom Slayer's brute force combined with the high - tech weaponry of Halo. The way the two different art styles and storylines blend is really engaging.
Good characterization is key. The Doom Slayer should stay true to his in - game persona - a silent, unstoppable force. For example, if he crosses over with a more talkative character from another franchise, the contrast should be well - written.
Well, it could be about the RWBY characters finding themselves in the Doom universe. Maybe Ruby and her team are trying to fight off the demons in Doom while also using their own unique abilities. They might team up with the Doom Slayer at some point to take on a big, bad enemy that threatens both universes.