One idea could be that the characters find a new home as a secret hideout from villains. They might use their quirks to build and customize it, making it a safe place full of unique features.
Maybe the new home is a large treehouse - like structure built in a forest. It would blend in with the natural surroundings and provide a peaceful yet secure place for the heroes. They could have different levels for different functions, like a training area on the lower levels and sleeping quarters on the upper levels. It could also be a place where they can study and analyze the quirks of villains and come up with counter - strategies.
I don't know for sure as I haven't read it. But surely the abandoned hero is one of the main characters. There might also be characters who abandoned him in the first place, like former friends or mentors. And perhaps on his journey home, he meets a guide or a new friend who helps him along the way.
I'm afraid I don't know specifically. But we can assume the hero at the center of it all. There might be friends from his past who he hopes to reunite with at home. Or there could be new friends he makes during his travels. And of course, there could be foes that try to stop him from getting home, which would make them important characters in the story as well.
I don't know the specific main characters as I haven't read it. But surely there is the abandoned hero himself. There may also be some characters who were involved in his abandonment, like former comrades or a mentor who turned against him. And there could be characters he meets on his journey home, such as friendly villagers or other travelers.
Since the novel is about an abandoned hero going home, the hero himself is a central character. He may have friends or family waiting for him at home who could also be important characters. Additionally, there could be characters he meets during his travels. For example, a wandering merchant who gives him information or a fellow traveler who joins him for part of the journey. These side characters can play important roles in shaping the hero's journey and development.
One of my favorite characters is All Might. He is not only an extremely powerful hero but also a symbol of hope. His role in mentoring Midoriya is crucial. He passes on his power, One For All, and also imparts valuable life lessons to Midoriya about what it means to be a hero.
In 'a hero comes home a bell sound novel', the hero could be a person with extraordinary abilities. He might have powers that helped him during his journey away from home. Maybe he has the power of super strength, or the ability to communicate with animals. His journey could have been to find a cure for a disease in his homeland or to defeat an evil force that threatened his people. The bell sound could then be a way to honor his return and all that he has accomplished.
The main character is surely the hero in this novel. Alongside the hero, there could be a love interest who has been waiting for them. There might be an antagonist from the hero's past who has caused some problems but now the hero is coming back to face or resolve them. Also, there could be a group of friends or neighbors who are part of the hero's support system and are actively involved in the grand welcome for Christmas.
To create compelling characters in My Hero Academia villain - hero fanfiction, first understand the existing character archetypes in the series. For villains, think about their motives. Are they after power like Overhaul? Or do they have a more complex backstory like Shigaraki? For heroes, don't just rely on their quirks. Develop their personalities, like All Might's unwavering sense of justice. Also, consider how they interact with each other. A hero and a villain could have a shared past that shapes their present relationship.