There's a possibility that the hero is a misfit or an outcast in society. This person has always been different and not fully accepted, but they possess unique qualities that make them the perfect candidate to be the hero the world needs. They might start off being underestimated, but as the story unfolds, they prove themselves to be the one who can change the world.
Most likely, the 'terror' itself is the antagonist. It's what the hero has to fight against.
Stain could be considered as an anti - hero in fanfiction. His extreme views on heroes, while not entirely acceptable, could be delved into deeper. He believes that only true heroes should be recognized and is willing to take extreme measures to prove his point. A fanfiction could explore a different side of him, perhaps one where his actions are more nuanced.
The main theme could be about heroism, perhaps exploring what it truly means to be a hero in a world that is lacking in some way. It might also touch on themes of redemption, as the hero could be on a journey to save the world from its problems.
The hero could be an ordinary person from our world, like a gardener. Since they already have knowledge about plants, they have an advantage in the garden game world. They could use their gardening skills to navigate through the game and solve puzzles.
Izuku Midoriya could be a great main character in a magic - infused fanfiction. Imagine if he discovers he has an innate magical ability on top of his One For All quirk. He could use magic to further enhance his physical abilities or develop new techniques. His determination and growth throughout the story would be even more exciting with the addition of magic.
Perhaps a new character could be introduced as the hero. A wizard or a powerful human with some extraordinary skills. This new character could be someone who has been observing Peter's actions from afar and decides to step in to save Bella when the time is right.
There's also a possibility that the main character is a female. She could be a healer in the highlands who discovers she has some hidden powers that are not just limited to healing. She might be thrust into a situation where she has to become a hero, maybe to protect her village or the entire highlands from a new and unknown threat. She would use her knowledge of the highlands and her new - found powers to face the challenges ahead.
It could be Alan Breck Stewart. He plays a significant role and shows bravery and determination throughout the story.
The male protagonist of the tragic world was Jean Valen in the French novel "The World of Miserables" by Hugo Weaving. Jean Valen was a poor, prisoner, and disabled poor French man. He was sentenced to a long prison term for stealing bread, but was sentenced to death for killing an innocent policeman. Through Jean Valen's life experience, the novel shows the dark side of French society and the complexity of human nature, and also reflects the deep thinking of social problems.
I'm not sure specifically which 'hero of theta novel' you're referring to. There could be many different characters considered heroes in various novels. Maybe it's a character with special powers or noble qualities within the context of that particular story.