I think being reincarnated as Loki would be super interesting. He's such a complex character with his own motives and schemes. You could take over Loki's life at a certain point and use your modern - day knowledge to either further his plans in a different way or completely change his path. Maybe you could prevent him from getting into so much trouble with Thor and the Avengers, or use his shapeshifting abilities in ways that no one in the Marvel universe has ever seen before.
Reincarnating as Doctor Strange would be really cool. You'd have access to his magic powers and the Sanctum Sanctorum. You could use your knowledge from your past life to learn the mystic arts even faster and perhaps discover new spells or ways to use magic. Also, you could use your knowledge of the future to better protect the Earth from threats like Dormammu. You might be able to change the events that led to some of the big battles in the Doctor Strange movies and comics.
For me, being reincarnated as Captain America would be the most interesting. You'd inherit his leadership skills and super - soldier strength. But you could also bring in modern ideas of equality and social justice to the 1940s when he was first created. You could use your knowledge of how the world would change to make better decisions during World War II. And later, when you wake up in the modern world, you could have a different perspective on how the Avengers operate and make changes to their strategies.
Cersei could be the most interesting in a sense. If she were reincarnated, she could either double down on her power - hungry ways or completely change. Maybe she could learn from her past mistakes and become a more benevolent ruler. Or she could use her reincarnation as a way to exact revenge on those who opposed her in her previous life in more devious and calculated ways.
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.
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.
Pikachu is often a popular choice. It's one of the most well - known Pokemon, and being reincarnated as Pikachu gives a lot of opportunities for fun and action - packed stories. Its electric powers and cute appearance make it appealing.
Well, a cool plot could be reincarnating into the body of a Stark Industries employee. You then use your knowledge of future tech from your past life to revolutionize Stark's inventions even further. This could lead to new and improved Iron Man suits way before they were originally created in the Marvel timeline. Or, you could be reincarnated as an Asgardian commoner but with a deep knowledge of Earth's cultures. You could introduce things like rock music to Asgard, creating a whole new cultural exchange between the two realms.
Tony Stark is also often reincarnated. It gives the opportunity to change the course of his life. For example, the reincarnated Tony could prevent some of the mistakes he made in the original story, like creating Ultron, or he could be given a different set of skills or knowledge at the start of his journey as Iron Man.
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.
It would be an exciting adventure. You could potentially meet your favorite Marvel characters, like Iron Man or Captain America. Maybe you'd get superpowers and join the Avengers in their battles against evil. It's a chance to be part of the amazing Marvel universe in a unique way.
Batman is quite popular. Reincarnating as him gives the character a chance to have all his gadgets and detective skills. Also, Superman is a common choice. Having his superpowers and being able to fly around Metropolis would be exciting. Wonder Woman is another one. Her connection to the Amazonian culture and her superhuman abilities make for great fanfiction material.