Emanuel Augustus is a character that adds depth to the story. His interactions with other characters, especially his relationship with Henry, help to further expose the racial and power dynamics at play in the known world of the novel.
Calantha is also significant. She is Henry's wife and her character helps to show the role of women in this world, both in terms of their relationships with men and their own agency within the constraints of the society.
In this novel, perhaps there is a rebellious character who challenges the existing order and is at the forefront of the awakening. There might also be a family member of the main character, like a parent or sibling, whose relationship with the main character is affected by the awakening process. And then there could be a mysterious character who appears at crucial moments and has some kind of special knowledge related to the awakening.
There's also Strangman. He is an interesting character who has a different approach to the drowned world compared to Kerans. Strangman seems more interested in exploiting the situation for his own gain in some ways, which creates conflict within the story. Another character is Beatrice Dahl, who has her own role in the complex web of relationships and the overall story of survival in this new world.
The protagonist is surely an important character. They are often the center of the story, through whose eyes we experience the events in the novel.
The protagonist, Haruyuki Arita, is very important. He is an overweight boy in the real world but becomes a powerful figure in the accel world. Then there is Kuroyukihime. She is a skilled and mysterious girl who plays a crucial role in Haruyuki's journey in the accel world.
I'm not sure specifically as I haven't read this exact 'home and the world novel'. But usually, there would be a protagonist who serves as the main lens through which we view the relationship between home and the world. This character might be someone who is caught between the two, trying to navigate their place in both.
Mat Cauthon is an important figure. He is Rand's friend, with a roguish charm and a mysterious connection to a dagger that brings him both trouble and power. Egwene al'Vere is also crucial. She is a strong - willed woman who begins to learn magic and has her own journey of growth and discovery in the story.
Sophie is the central figure. She is a young girl with a thirst for knowledge, especially about philosophy. Alberto Knox plays a crucial role as he imparts philosophical wisdom to Sophie. He is like a mentor to her. Hilde Moller Knag is another key character. Her presence adds an element of mystery and complexity to the plot, as there are connections between her and Sophie that are gradually revealed throughout the novel.
John the Savage is a very important character. He is an outsider brought into the 'brave new world' society. His different values and beliefs clash with the norms of this new world. Bernard Marx is also important. He is an Alpha - Plus who feels alienated from his own society and starts to question the way things are. Lenina Crowne is another key character. She is a typical product of the new world, following the social norms but also having some internal conflicts when she gets involved with John.
Phileas Fogg is the most important character. He is a wealthy and punctual English gentleman who makes a bet to travel around the world in 80 days. Passepartout is also crucial. He is Fogg's French valet who accompanies him on the journey. And then there is Detective Fix, who wrongly suspects Fogg of a bank robbery and chases him throughout the trip.
I'm not sure specifically as I haven't read this particular novel. But often in Turkish novels, there are strong - willed female characters who play important roles in challenging the status quo. There might also be an older, wiser character who represents the traditional values of the community.