Not necessarily. There are many fictional characters with incredibly powerful abilities and it's hard to say for sure if Doom Slayer is the absolute strongest.
The fanfiction might also play with the idea of redemption for the female demon. Since the Doom Slayer is often associated with justice, perhaps he sees some potential in her to change. It could be a story of her trying to break free from her demonic nature with the help of the Doom Slayer. Their relationship could develop from pure enmity to something more complex, like an unlikely alliance or even a romantic connection in a more extreme take on the story.
Well, 'Doom Slayer: Redemption' is a great fanfic. It shows the Slayer's struggle with his own inner demons while still fighting the literal demons. Then there's 'The Doom Slayer's Allies'. This fanfic explores the relationships the Slayer could have with other characters, whether they be human survivors or other powerful entities. And don't forget about 'Doom Slayer: In the Wasteland'. It's set in a post - apocalyptic world where the Slayer has to face not only demons but also the harsh environment.
There are definitely some 'Goblin Slayer x Doom' fanfics. One interesting aspect that some of these fanfics explore is the different combat styles of the two main characters. The Goblin Slayer is more methodical in his approach to dealing with goblins, while the Doomguy is all about brute force against demons. In a crossover fanfic, seeing how they would either learn from each other or clash because of their different styles can be really engaging. Also, the settings of the two can be blended in unique ways, like the dark and gritty world of 'Doom' with the medieval - ish setting of 'Goblin Slayer'.
Well, the plot could involve a rift opening between the two worlds. Goblins start pouring into the Doom world and the Doomguy has to deal with them. Meanwhile, the Goblin Slayer follows the goblins through the rift and they end up working together to close the rift and stop the chaos. They might exchange combat techniques and learn from each other's experiences along the way.
However, Denji as Chainsaw Man also has his own set of powers. He can transform into a powerful chainsaw - like being and has shown great resilience. But compared to the Doom Slayer, he lacks the same level of experience in dealing with the kinds of threats that the Doom Slayer has faced on a regular basis. So, overall, the Doom Slayer would probably be more powerful in a direct comparison.
For some, it's the potential for unique character development. The female demon could start out as a typical villain but then grow and change throughout the story. And the Doom Slayer, who is usually so single - minded in his destruction of demons, might have to adapt his views. It offers a chance to explore different sides of these well - known characters in a new context.
First, know the lore of Doom well. Understand the Doom Slayer's character, his abilities, and his purpose. Then, come up with an interesting plot. It could be something like the Slayer facing a new type of demon or exploring a new dimension. Next, create some engaging characters to interact with the Slayer. They could be allies or foes. And don't forget to write in a way that captures the action - packed and dark atmosphere of the Doom universe.
One possible plot could be that the Doom Slayer gets transported to the Chainsaw Man universe. He teams up with Denji to fight against a new type of demon that is a combination of the demons from Chainsaw Man's world and the hellish creatures from the Doom universe. Their combined strength and different fighting styles make for an epic battle.
The Doom Slayer could be a mysterious figure in the My Hero Academia fanfiction world. He might be from a parallel dimension where his fight against demons is similar to the heroes' fight against villains. He could team up with the likes of All Might or Deku, teaching them about his unwavering determination. His presence would add a new level of intensity to the battles, as he doesn't hold back and is used to facing much more terrifying foes than the average villain in My Hero Academia.