Another interesting interaction could be between Vaggie and the Doomguy. Vaggie is protective of Charlie and the hotel's mission. When she meets Doomguy, she might be suspicious of his motives. She could be constantly on guard around him, and he might be a bit annoyed by her over - protectiveness. Their relationship could start off as very tense but could develop in interesting ways as they get to know each other better.
The Doom Slayer and Charlie would be an interesting pair. Charlie is all about redemption and trying to make Hell a better place, while the Doom Slayer is focused on pure destruction of demons. Their meeting could lead to some great character development. Charlie might try to convince the Doom Slayer that not all demons are irredeemable, while the Doom Slayer could show Charlie the true horror that some demons are capable of.
Ron and Angel Dust. Ron is often the more down - to - earth and food - loving character in Harry Potter. Angel Dust, on the other hand, is flamboyant and has a wild side. Their differences could lead to some really comical and also heartwarming interactions. Ron could introduce Angel Dust to some wizarding world food, and Angel Dust could show Ron some of the unique and fun aspects of Hell's nightlife, while also learning about loyalty from Ron, which is something he might lack in his own life.
Naruto and Charlie would be an interesting pairing. Naruto with his positive attitude towards redemption and Charlie with her hotel for redemption could have some great interactions. They could share their ideas about helping people who have made mistakes.
The Doom Slayer and a Space Marine would be really interesting. They both are combat - focused and have a strong sense of duty. They could start off as rivals, each thinking their way of fighting is superior, but then come to respect each other after facing a common enemy like the forces of Chaos.
One possible plot could be that the Doom Slayer somehow ends up in the Hazbin Hotel universe. He might initially be seen as a threat due to his violent nature. But then, they realize he could be an asset in dealing with some of the more dangerous demons in the Hazbin Hotel world. For example, he could help Charlie and her crew deal with some of the more unruly and powerful demons that are causing trouble in and around the hotel.
Definitely the Emperor of Mankind. The contrast between the all - seeing, all - powerful (sort of) Emperor and the single - minded, brutally efficient Doom Slayer would be fascinating. They could have a complex relationship, with the Emperor trying to direct the Slayer's rage for the 'greater good' of the Warhammer universe.
There are a few out there. However, the quality can vary a great deal. Some fanfictions might be more action - oriented, with the Doom Slayer getting involved in the chaotic world of Hazbin Hotel, perhaps fighting against some of the demons there in his own brutal style. Others could be more about character relationships and how the two very different characters from different franchises would get along or clash.
One possible plot could be that the Doom Slayer somehow gets teleported to the Hazbin Hotel universe. He then has to deal with the demons there, which are different from the ones he usually fights. The hotel staff might initially be afraid of him, but then realize he could be an asset in dealing with more malevolent demons.
The Doom Slayer and Vali would make for an exciting interaction. Vali is a very powerful and ambitious character in High School DxD. He would likely see the Doom Slayer as a rival or a potential ally in his quest for power. The two of them could engage in some epic battles or team up against a common enemy. Additionally, the interaction between the Doom Slayer and Koneko would be interesting. Koneko is a quiet and strong - willed character, and she might be curious about the Slayer's motives and his unwavering dedication to his mission.
Maybe the Hazbin Hotel is in the middle of a crisis where the souls of the damned are being consumed in a strange and new way. Charlie and her crew suspect it has something to do with a portal that has opened up to a dimension filled with the kind of demons the Doom Slayer is used to fighting. They seek out the Doom Slayer, who has to navigate the politics and oddities of Hazbin Hotel's Hell while trying to close the portal and stop the consumption of souls.