Alucard from Hellsing would be really interesting. He has such a long and complex history, and his powers are very different from the Twilight vampires. Putting him in a situation with the Twilight characters would create a lot of drama. For example, his non -chalant attitude towards killing and his dark sense of humor would contrast greatly with the more brooding and 'good -guy' Twilight vampires.
Seras Victoria from Hellsing could also be a great choice. She is a relatively new vampire in the Hellsing universe and still has some of her human qualities. In a fanfic with Twilight, she could serve as a bridge between the two worlds. She might be more understanding of the Twilight vampires' more 'human - like' nature while also being loyal to the Hellsing way of dealing with the supernatural. This could lead to some really interesting internal and external conflicts as she tries to navigate between the two very different vampire cultures.
I think Bella from Twilight could be an interesting focus. If she were to be inserted into the Hellsing world, she would be completely out of her depth. Her naivete and her experience with the relatively 'gentle' Twilight vampires would be a sharp contrast to the horror and bloodshed in Hellsing. It would be fascinating to see how she adapts and whether she can keep her moral compass in such a different and dangerous place.
Most likely Alucard. In the Hellsing universe, he is an extremely powerful vampire with a vast array of abilities. In comparison, the vampires in Twilight, while having their own strengths, seem rather weak when pitted against Alucard. He can manipulate shadows, has superhuman strength far beyond what we see in Twilight vampires, and his immortality is of a different level altogether.
I think Clary from Shadowhunters would be really interesting. She's a strong - willed and powerful shadowhunter. If she were to cross paths with the Twilight characters, her inquisitive nature would lead her to try and understand their world. And her skills as a shadowhunter could be put to the test when dealing with the vampires and werewolves in Twilight.
Edward would be really interesting. His brooding and mysterious nature from Twilight would contrast sharply with the often over - the - top and energetic world of Glee. He could bring a sense of depth and angst to the Glee club. His musical talent, which was hinted at in Twilight, could be explored more fully in the Glee setting. He might struggle with fitting in, not because he's not talented, but because of his vampire secrets.
Alice from Twilight could be a fascinating character to focus on. Her ability to see the future could play an interesting role in a crossover. She could either help or hinder the Ghost Adventures crew in their investigations. Maybe she sees something in the future that involves the ghosts and tries to prevent or encourage the crew's actions.
A character like Edward from 'Twilight' could also be great. If he were to encounter the world of 'Dark Paradise', his sense of morality and self - control might be put to the test. He could be intrigued by the different vampire culture there and might have to make difficult decisions about whether to embrace or reject it.
Luna Lovegood would be an unexpected but fascinating choice. Her unique perspective and belief in all kinds of magical creatures could make her very open - minded about the vampires and werewolves in the Twilight world. She might see them as just another type of magical being and try to find common ground, which could lead to some really interesting interactions and storylines.
I think Naruto and Integra would be a fascinating pairing. Integra is a strong and authoritative leader in the Hellsing world, and Naruto has his own leadership qualities within his ninja team. They could have some really interesting discussions about leadership, duty, and protecting their respective worlds. Also, Kakashi and Alucard would be a cool pair. Kakashi is known for his calm and collected nature, and Alucard's unpredictable and powerful presence would create a great dynamic. They could exchange knowledge about combat techniques and strategies from their different worlds.
Alucard and Dean Winchester would be an interesting pairing. Alucard's dark and brooding nature, combined with his overpowering abilities, would contrast with Dean's more impulsive and human - centered approach.
Mercury from RWBY could be an interesting character to focus on. He has a rather morally ambiguous nature already. In a Darkwatch fanfiction, he could be tempted by the power of the Darkwatch's enemies, like the vampires or demons. His prosthetic legs could also be given some kind of dark upgrade, and we could see him struggle between his own self - interest and the greater good in this new and dangerous setting.
Raphael could be really interesting. In the 2003 version, he is hot - tempered and tough. In the 2012 version, he also has a strong personality. Seeing how he reacts to his counterpart and how they might either clash or bond could be a great focus. Maybe they have a friendly rivalry as they compare their fighting skills.