I'm not entirely sure as I haven't read it specifically, but it could be scientists who are studying the thing, or military personnel trying to deal with it.
Since I don't know the exact novel, it's hard to say. But usually, there would be a protagonist who is likely to be the one who first encounters the thing from another world. There might also be a sidekick or a friend who helps the protagonist in dealing with the situation.
The main plot of a 'thing from another world novel' could revolve around the cultural clash between the world the 'thing' comes from and the world it enters. For example, if the 'thing' is a sentient being, it may have different values, abilities, or ways of communication. The novel might explore how the characters in the known world react to this alien concept. It could also be about a scientific discovery related to this 'thing', where scientists try to figure out its origin, composition, and purpose. This could lead to a race against time if the 'thing' poses an immediate danger or if there are other parties interested in exploiting it.
The plot typically involves a strange entity from another world arriving in a particular setting, often causing chaos and fear among the characters. The story might revolve around the discovery, attempts to understand, and ultimately dealing with this alien thing.
The titular milf hunter is surely a main character. He could be a complex character with his own motives and flaws. There may be other characters such as local inhabitants of the other world who play significant roles. Some of the milf characters could be main characters too, for example, a milf who has some sort of power or knowledge that the hunter needs. There might also be a character who is in conflict with the hunter over his'milf - hunting' activities, perhaps a protector of the milf characters or someone with a different view on how to deal with them.
I'm not sure specifically as I haven't read the exact story. But it could be an ordinary person who discovers the best thing in the world through a simple yet profound experience, like a child who finds beauty in nature.
There is also a young waitress who plays an important role. She helps out in the restaurant and has some interesting interactions with the otherworldly guests. And then there are the regular customers from the other worlds, like the elf - like beings or the big, burly warriors from far - off lands, who are sort of main characters in their own right as they bring their own stories and personalities to the table.
The main character is Touya Mochizuki. He is the one who gets sent to another world with his smartphone.
Well, usually there's the protagonist who is banished. This person might be an ordinary individual in their own world but has to become extraordinary in the new one.
I don't have the specific information, but likely the empress herself is a main character. There might also be characters like her advisors, enemies who oppose her rise to power, and perhaps some friends or allies she makes along the way.
Yes, it's generally regarded as canon. The comic fits within the established universe and storyline.