Who could be the main characters in an 'x doom crossover fanfic'?

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.

Definitely Dipper and Mabel from 'Gravity Falls' would be main characters. And from 'The Replacements', Todd and Riley could be the main ones. They would be the ones driving the plot forward as they interact with the new and strange world or characters they encounter.

Obviously Naruto would be one of the main characters. And from 'The 100', Clarke would likely be a main character as well since she is a central figure in her own show.

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.

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.

If it's a crossover with a magical world, then perhaps a new character could be introduced as the main character. A young wizard who befriends Manny, Sid, and Diego. This wizard could be the one to bring the Ice Age world and the magical world together. But still, Manny, Sid, and Diego would play important supporting roles as the main characters navigate through the crossover story.

Maybe James Bond and a character from a post - apocalyptic fandom. Bond is used to high - stakes espionage in London, and the post - apocalyptic character could bring a different perspective. They might meet when Bond discovers a threat that is related to the post - apocalyptic world's problems, and they have to work together to stop it. The contrast between Bond's suave sophistication and the post - apocalyptic character's survival skills would be exciting.

Ayano could also be a main character. Her connection to Kazuma and her own abilities within the 'kaze no stigma' universe could bring a different dynamic. In a crossover, she might be the one to discover the secrets of the new world they enter or be the one who has to make difficult decisions about how to interact with the new characters.

Loki and Zuko could be main characters in such a fanfic. Zuko has his own journey of redemption and Loki has his own complex past. They could bond over their struggles with identity and family. Zuko's firebending skills would also be an interesting contrast to Loki's magic. They could either become enemies or form an unexpected friendship as they navigate the challenges in a world that combines the elements of Asgard and the Avatar universe.

Twilight Sparkle could be a main character. Since she is very intelligent and curious, she might be the one who gets drawn into the Creepypasta - related events. Her knowledge of magic could also play a crucial role in either solving the problems caused by the crossover or in getting trapped in the first place.