Since I don't have detailed knowledge about this 'love in fallen city novel', it's hard to say exactly. However, in a novel with such a title, we might expect to find characters like a young, idealistic protagonist who falls in love and is affected by the state of the fallen city. There could also be an older, wiser character who provides some perspective on the situation.
In 'Love in a Fallen City', Liusu is a main character. She is a complex woman dealing with love and survival in a challenging time.
One main theme could be love and its complexity. In a fallen city, love might be a glimmer of hope or a source of despair. Another theme could be the decay of society which serves as the backdrop and influences the relationships in the novel.
I don't know for sure as I haven't read it. But it could be some of the characters from the main 'City of Fallen Angels' story, like the angels or the humans living in the city.
I'm not sure specifically as I haven't read this particular 'fallen angels novel'. But generally, there could be the fallen angels themselves as main characters. They would likely have complex personalities, torn between their former angelic selves and their new, fallen states.
Not having read the 'fallen star novel', it's difficult to say for sure. However, typically in a story with such a title, there would likely be a central character who represents the fallen star. This character might be a complex figure with a backstory that led to their fall. There could be other characters related to this main character in different ways. For instance, a mentor - like figure who had high hopes for the fallen star and is now disappointed, or a love interest who is torn between loyalty and the reality of the star's changed situation. There may also be characters who are indifferent to the fallen star's plight, which could add to the complexity of the story's social dynamics.
Since I don't know the exact 'fallen god novel', it's hard to say. But it could have the fallen god as a main character, of course. There might also be characters who either help or hinder the fallen god, like a mortal who befriends the god or another divine being who was involved in the god's fall.
I'm not familiar with this particular graphic novel. However, if it's about a fallen angel theme, the main characters could be the angel itself, perhaps with some other celestial beings who are either trying to redeem the fallen one or are in opposition to it. There could also be human characters who get involved in the angel's journey on Earth.
Since I don't know the exact 'fallen angel novel', it's difficult to name the main characters. But usually, there would be the fallen angel as a main character. There might also be a human who gets involved with the fallen angel in some way, like a love interest or an ally.
Since I don't know the exact 'fallen order novel', I can't say for sure. But it could have a protagonist who is a member of the fallen order, trying to make things right. There might also be a mentor - like figure who has some knowledge of the order's past and can guide the main character.
I don't know for sure as I haven't read the 'fallen chronicles novel'. But they could be people who are directly involved in the events related to the fall, like a leader who loses their power or a hero who fails.