It could be a war veteran who has returned to the city but finds it hard to adjust to civilian life. So, he gets drawn into the criminal activities out of desperation or a sense of being lost. He would have unique combat skills from his military days which would come in handy in the violent world of GTA.
It could be a young adult who has just graduated from college and is starting their career. This is a new beginning for them as they enter the professional world, face new responsibilities, and strive to achieve their dreams.
It could be a young detective who is trying to solve the mystery of the Death Note's reappearance. He might be really smart and determined to stop whoever is using the Death Note for evil purposes.
The new GTA story could focus on a group of characters instead of just one. They could be a team of hackers who use their skills to disrupt the criminal underworld in the GTA city. They start by stealing money from the gangs electronically but soon find themselves in over their heads as the gangs fight back. Along the way, they have to use their hacking abilities to outsmart the police surveillance systems too. There would be a lot of high - tech elements, like hacking into security systems to access restricted areas and stealing valuable data from criminal organizations.
A fearless detective could be the main character, solving complex crimes in a big city.
I think Spider - Man would make an interesting main character. He's young and has a different perspective compared to the more experienced Avengers. His journey of growing up and becoming a more integral part of the team could be a central theme in the fanfiction. He also has his own set of personal problems like school and his relationships which could add depth to the story.
Perhaps a minor character from the original Fate series could be promoted to the main character. For example, a bystander in one of the battles who witnessed something extraordinary and was then drawn into the world of the Holy Grail War in a more central way in the 'a new fate fanfiction'.
It could be an ordinary person from our world, like a high school student. They're suddenly thrust into this new world and have to adapt. Their inexperience in this new environment can lead to many humorous and exciting situations.
It could be a young woman who has just moved to a new town and is unaware of the horror associated with Mondays there. She becomes the target of the strange and terrifying events.
It could be a transfer student from another school who has heard about the dark secrets of Hope's Peak Academy. This student is determined to change things for the better. They might be the 'Ultimate Hope - Bringer' or something similar, and they use their unique perspective and skills to try to break the cycle of the killing games and give everyone a new hope.
A Ditto could be the main character. Since it can transform into other Pokemon, it could have a unique perspective on different Pokemon species and their lives.