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.
Another interesting pairing would be Doom Slayer and Erza. Erza is a strong and disciplined mage. She would be intrigued by Doom Slayer's unwavering determination. They could bond over their shared sense of justice. Erza might even try to learn from Doom Slayer's single - minded focus on destroying evil. And Doom Slayer could be impressed by Erza's ability to handle various types of magic and her leadership within the Fairy Tail guild.
Well, it could be a wild adventure. Imagine the Doom Slayer in the Fairy Tail world. He might be seen as a super powerful mage with his insane combat skills. He could team up with Natsu and the gang to take on some really tough enemies. Maybe they face a demon invasion in the Fairy Tail world, and the Doom Slayer's advanced weaponry and his unwavering determination would be a huge asset to the Fairy Tail guild.
Lucy would likely be a bit scared of the Doom Slayer initially. But as she gets to know him, she could start to see his good side. The Doom Slayer might not be very talkative, but his actions would speak volumes. He might save some of the Fairy Tail members from danger, and they would start to trust him. Happy might try to make the Doom Slayer laugh with his silly antics, though it's not likely to be an easy task.
Definitely Geralt from The Witcher. His knowledge of monsters and magic could complement the Doom Slayer's brute force. They could work together to hunt down some powerful demons that are causing chaos in both their worlds.
A possible fanfiction could involve Naruto's ninja skills combined with the God Slayer magic from its respective series and the magic of Fairy Tail. For example, Naruto could team up with Natsu from Fairy Tail and a God Slayer character to take on a powerful enemy that threatens all three of their worlds. They would each bring their unique abilities to the fight, like Naruto's shadow clones, Natsu's fire magic, and the God Slayer's divine - based powers.
One idea could be a crossover with the Halo universe. The Doom Slayer could team up with Master Chief to fight against a common alien threat that has invaded both their worlds. They could share their combat skills and weaponry knowledge.
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.
One great 'Fairy Tail Dragon Slayer Fanfic' is 'The Dragon Slayer's Ascent'. It really dives into the growth of the dragon slayers in a unique way. It shows their struggles not just with their dragon powers but also in their relationships within the Fairy Tail guild. Another one is 'Dragon Slayers United' which focuses on how the dragon slayers work together against a common enemy that is far more powerful than any they've faced before.