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.
The clash of different powers and personalities. For instance, when the Doom Patrol crosses over with another team, like the Teen Titans. The Doom Patrol has these really strange and out - there powers, like Crazy Jane's multiple personalities each with their own powers. When combined with the more straightforward powers of the Teen Titans, it creates really unique storylines.
One great 'Doom Patrol Crossover Fanfic' is 'Doom Patrol Meets the Titans'. It combines the quirkiness of the Doom Patrol with the more well - known Titans. The interactions between the characters are really interesting, like when Robotman and Cyborg have a conversation about what it means to be part machine.
Some doom crossover fanfic ideas include a crossover with the Dark Souls universe. The Doom Slayer could be in the gloomy and challenging world of Dark Souls, facing off against tough bosses and hordes of undead. Another idea is a crossover with the Devil May Cry series. The Doom character might team up with Dante or Vergil to take on demonic threats. And a crossover with the Mass Effect universe could be about the Doom hero getting involved in the fight against the Reapers and other intergalactic menaces.
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.
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.
First, decide which two universes you want to cross over. For example, if it's Doom and Star Wars, research both universes thoroughly. Know the characters, settings, and rules of each. Then, come up with a basic plot. Maybe the Doom Slayer is transported to the Star Wars galaxy and has to fight Sith Lords. Next, create a character profile for your main character, whether it's the Doom Slayer in a new setting or a new character that combines elements of both universes. Start writing, focusing on creating an engaging opening that hooks the reader.
Definitely Doomguy as one of the main characters. He is the iconic figure of the Doom series and his presence is essential. Another could be Lara Croft from the Tomb Raider series. Her skills in exploration and combat could complement Doomguy's abilities. They could be on a quest to stop an ancient evil that has ties to both their worlds, like a demonic force that is also seeking some powerful artifacts that Lara has been studying.
Perhaps a crossover with a fantasy world. Doomguy enters a realm filled with magic, elves, and dragons. He might initially be seen as an outlander, but as he battles the demons that have also invaded this fantasy world, the inhabitants start to see him as a valuable ally. The clash between Doomguy's advanced weaponry and the magic of the fantasy world would be a fascinating aspect to write about.
One possibility in this fanfiction could be that Naruto's positive and determined nature clashes with Doctor Doom's tyrannical and power - hungry ways. Maybe Naruto is transported to Doctor Doom's world and tries to bring his sense of justice there. He might use his ninja skills to outwit Doom's high - tech defenses.