Without having read the graphic novel, it's difficult to name the main characters. But it's likely to have a character who is an outsider in the water - scarce world. Maybe they come from a place where water was more plentiful and have different ideas about how to deal with the situation. There could also be a local leader type of character who is trying to keep order among the people desperate for water, and their relationship with the other characters could be a major part of the story.
I'm not entirely sure as I haven't read it specifically. But generally, a 'not a drop to drink' concept might be about a world where water is scarce. So the graphic novel could be about characters struggling to find water, facing conflicts over water sources, and perhaps the lengths they go to survive in such a water - starved environment.
I don't know specifically as I haven't read it. But in Lehane's novels, there are often complex and morally ambiguous characters.
Since the title has the idea of 'a drop in the ocean', the main characters might be ordinary people who find themselves in extraordinary situations. Maybe it's a family of sailors who feel small against the might of the ocean. Or it could be a writer who comes to a seaside town to find inspiration and discovers that his or her presence there is like a drop in the ocean of the town's rich history and complex social fabric.
I'm not entirely sure without having read it recently, but usually in such a novel, there is a protagonist who drives the story forward. There might also be a sidekick or a mentor figure who helps the protagonist in his or her journey.
Since I don't know much about 'Sound of Drop Visual Novel', it's difficult to name the main characters. However, in many visual novels, there is often a central character around whom the story revolves. This character might be joined by a diverse cast, such as a mentor figure, a love interest, or a sidekick with a unique personality.
I don't know for sure as I haven't read it. But it could be the characters from the original work that the fanfic is based on. Maybe the main character is the one who gets poisoned or the one who tries to administer the poison.
The main character is the Lemon Drop Kid.
The main character is obviously the little drop of rain itself. It's the one whose journey we follow throughout the story.
Since I'm not familiar with the story, it might be the owner of the bakery as a main character. There could also be regular customers who played an important role in the story, like the first customer who gave great feedback and helped spread the word about the bakery.
I don't know for sure as I haven't read it. However, it could feature Naruto himself as he is the main character in the original series. He might be the one trying to counter the effects of the 'drop of poison' in the story.