Obviously, the waitress and the grumpy old war veteran are the main characters. There might also be some other minor characters like the cook in the diner where the waitress works or other regular customers who interact with them in some way.
The two main characters are the waitress and the veteran. The waitress could be a young woman, maybe new to the job, full of energy and kindness. The grumpy old war veteran, on the other hand, is likely to be a man who has seen a lot in the war. He may have physical or emotional scars from his military experiences. There could also be a manager at the place where the waitress works, who might at first be a bit impatient with the veteran's grumpy behavior but later comes to understand the situation because of the waitress's influence.
Maybe the waitress tries to be kind to the grumpy old war veteran. She might offer him special service or just be patient with his grumpy attitude. And in the end, the veteran might soften up because of her kindness.
Most likely the main character is the grumpy old troll itself. There might also be some other characters like the people or animals that the troll interacts with, such as the villagers who try to cross the bridge that the troll guards.
In a 'grumpy old men story', the main characters are likely to be the old men who display their grumpiness in various situations. There might be a leading grumpy old man who is the central focus, and then there could be other old men around him who either support or oppose his grumpiness. There may also be characters like the young people in the neighborhood or family members who are affected by the grumpy old men's behavior, but ultimately, it's the old men that drive the story forward.
Since it's called 'grumpy old men quarter story', the main characters are probably those grumpy old men. But without more details, we can't know if there are any other important characters like their wives, or some local shopkeepers who interact with them regularly.
Since I haven't read it, I can only guess. Obviously, the grumpy old man is one of the main characters. There might also be people around him like his neighbors. If he has a family, family members could be main characters too, such as a son or daughter who has to deal with his grumpiness.
The main characters would be the grumpy old men. They might be retired fishermen or just neighbors who are always grumbling about life. And then there are the three bears. They could be wild bears from the forest. The old men might interact with the bears in different ways, like the first old man being really scared of them, the second one trying to shoo them away, and the third one being a bit more curious about them.
The characters in the 'grumpy old men bacon story' are probably a group of old men. They might be retired and have a lot of time on their hands. One could be a former farmer who has strong opinions about bacon quality as he used to deal with pigs. Another might be a retired cook who is very particular about how bacon should be prepared. And there could be a third old man who just loves bacon but is always in a bad mood, and his friends' habits around bacon annoy him.
I'm not familiar with the 'the grumpy bug online story', but based on the title, the main character is surely the grumpy bug. There could be other characters like friendly bugs that try to cheer it up, or maybe some digital villains that make the grumpy bug even more grumpy. Maybe there are also some human - like avatars in the online world that the grumpy bug has to deal with.
There are also fanfictions that focus on the less - known war veterans. For example, some of the jonin or chunin who fought bravely but were not in the spotlight as much. Their stories of survival, their hopes and dreams after the war can be the main focus of the fanfiction, which gives a different perspective compared to the well - known characters.
There's no way to tell without reading it. However, it's possible that the main characters are kids who are constantly in a bad mood. They might be a boy and a girl, each with their own reasons for being grumpy. Maybe the boy is grumpy because he has a lot of schoolwork, and the girl is grumpy because she doesn't get along with her siblings. These characters could then go through various situations in the story that are related to their grumpiness.