One interesting character to reincarnate as in a'reincarnated into twilight fanfiction' could be Esme Cullen. She has such a nurturing and kind nature, and you could delve into her backstory more, like how she adjusted to becoming a vampire. Another great choice would be Seth Clearwater. As a young werewolf, you could explore his growth and how he views the complex relationships between the werewolves and vampires. You could also have him form unexpected friendships or alliances within the Twilight world.
I think reincarnating as Alice Cullen would be really cool. Her ability to see the future is so fascinating, and you could expand on that in a fanfiction. You could show how she deals with the stress of seeing different possible futures all the time. Also, reincarnating as Jacob Black could be interesting. You could explore his relationship with the vampires from a different perspective, especially since he has his own strong beliefs and values as a werewolf.
Reincarnating as Carlisle Cullen could be interesting. You could explore his past more deeply and maybe change some of his decisions regarding the vampire lifestyle. Another option would be to reincarnate as Rosalie Hale. You could show her softer side and how she copes with her past traumas in a different way.
Being reincarnated into Master Roshi would be an unexpected but fascinating choice. With the knowledge of modern times, the reincarnated person could introduce new training techniques to Goku and Krillin from the very beginning. They could also use Roshi's pervy side in a more comical way to create some light - hearted moments while still being a respected martial arts master.
Reincarnating as Tyrion Lannister would be really interesting. He's already a complex character with a sharp mind. As someone reincarnated, you could use your modern ideas to enhance his political acumen even more. You could also try to change his relationship with his family for the better, or at least make his life less miserable while still being the clever dwarf everyone fears and respects in the political arena.
Reincarnating as Midoriya Izuku before he gets One For All would be a great choice. You could then explore different ways he could have become a hero without inheriting that quirk. He could develop his own unique fighting style based on his intelligence and analysis skills. Also, reincarnating as Todoroki Shoto and changing his relationship with his father from the start, perhaps leading to a more harmonious family and a different kind of hero development for Todoroki.
Definitely Jaime Lannister. His character had a lot of development in the original series. If reincarnated, he could either redeem himself even further or take a completely different path. He might try to make amends for his past actions by becoming a true knight, or he could turn against his family if he realizes the toxicity of their ways. His reincarnation would bring a whole new set of possibilities to the story.
Reincarnating as Midoriya but with some changes in his quirk manifestation could be fascinating. For instance, what if instead of getting One for All in the normal way, the reincarnated Midoriya discovers a different way to unlock and use the quirk? This could lead to a whole new set of adventures and challenges, and also a different dynamic with the other characters.
I think Thor and Carlisle would be really interesting. Thor is a god with all his power and Carlisle is an old - school vampire with a strong moral code. They could have some deep conversations about life, death, and power. And then there's Jacob and Bruce Banner. Jacob's hot - headedness and Bruce's struggle with his inner Hulk could lead to some intense situations. Maybe Jacob could help Bruce control the Hulk in some way, or they could get into a big fight that the others have to break up.
I think it would be Loki. In this crossover, Loki could use his trickery to manipulate the Twilight vampires. He might see them as a new tool to achieve his goals. He could pretend to be on their side and then turn on them when it suits him. His magic and cunning would add a whole new level of chaos to the story.
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.
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.