There could be a brilliant scientist character. In a story set across the universe, a scientist would be crucial for understanding the new worlds, technologies, and phenomena that are encountered. They might be the one who figures out how to solve problems related to the strange new environments.
I'm not sure specifically as I haven't read it in full. But generally, in this kind of light novel, there could be a young and brave protagonist who is eager to explore the universe. There might also be a wise mentor figure to guide the protagonist on their journey.
Love could be a main theme. In many stories set in the universe, love often transcends boundaries, whether they be physical distances between planets or different species. It can be about the love between characters that drives the plot forward.
As I don't know the details of this 'across the river novel', I can't tell you the main characters.
I don't have enough information to tell who the main characters are. Since it's just the title 'across the bridge novel', it could have a wide variety of character types, like a young adventurer, an old hermit, or a family trying to cross the bridge for some reason.
I'm not sure specifically as there are countless 'across the time fanfic' out there. It could be the main characters from the original work that the fanfic is based on. For example, if it's a fanfic based on 'Doctor Who', the Doctor could be one of the main characters as he is already associated with time - travel.
The main character is the overlord, of course. He's the central figure around which the story revolves.
I don't know exactly who the main characters are since I haven't read it. But it's likely that there are angels as main characters, maybe an archangel who has a significant role to play in the events of the story.
It's possible that the main character is a survivor of some great catastrophe that led to the world becoming desolate. Alongside them, there could be a group of comrades with different skills and personalities. Some might be good at combat, while others are more knowledgeable in things like survival techniques or ancient lore.
No, it isn't. 'Across the Universe' is a fictional story created for entertainment purposes.
I'm not entirely sure as it depends on the specific fanfiction. It could be original characters created by the author who are designed to fit into this unique 'across the void' setting. Maybe there are some characters that are based on pre - existing universes but have been adapted to this new concept.