I don't know the 'the bottle short story' well enough to say for sure, but it could be a lonely fisherman who discovers the bottle and a mysterious figure whose message is in the bottle.
As I haven't read the story, it's hard to tell. Maybe there is a young child who finds the bottle and an old storyteller who helps the child understand the significance of what's inside. Another possibility could be a shipwrecked sailor and the person who eventually finds the bottle with the sailor's last words.
Typically, the main character is the person who finds the bottle, like a young adventurer or an ordinary person going about their day. And of course, the genie is also a main character. The genie is the one with the magical power to grant wishes and often has a personality of its own, sometimes being mischievous or wise.
There is usually a person who first gets the bottle imp. This character is often someone who is either in need or is greedy for power or wealth.
The main characters usually include the person who writes the message and puts it in the bottle. This character is likely to be in some sort of difficult or isolated situation. The other main character is the one who finds the bottle. They could be from a completely different background. For example, the sender could be a marooned pirate and the finder a young scientist exploring the shore. Their encounter through the bottle forms the core of the story.
The main characters are usually the person who finds the bottle and the genie inside it.
The main character is most likely the person who is leaving the notes in the bottle. They are the one through whose perspective we see the events of the story unfold. There might also be other characters who are only mentioned briefly, like people from the narrator's past or those in the situation that led to the notes being written.
The main characters include the initial finder of the bottle. This person stumbles upon the strange bottle with the imp inside. Then, of course, the imp which is a very important character as it controls the power of the bottle and sets the rules for its use. Additionally, all those who get involved in the buying and selling of the bottle are main characters. They each face the difficult situation of trying to sell the bottle while using its magic to their advantage.
Well, the main character is likely the first person who comes into possession of the bottle with the imp. Then there are probably other characters who the bottle is passed on to. These could be people who are either greedy and see the opportunity for wishes or are desperate and willing to take the risk of the bottle's curse. However, without a more in - depth read of the 'the bottle imp full story', it's hard to name specific characters.
There could be a mermaid and a bottle. The mermaid finds a bottle floating in the ocean. Inside the bottle is a love letter from a human on land. The mermaid is fascinated by this letter and decides to find the person who wrote it. So the mermaid and the bottle start this journey together. The bottle serves as a guide and a connection to the human world, and the story could be about the mermaid's search for love across the boundaries of two different worlds.
The main characters are usually the person who finds the bottle and the genie inside the bottle.
I'm not entirely sure as I haven't read the exact novel. But usually in such a story, there would be the person who sends the message in the bottle. And then there might be the one who finds it, and they would be important main characters.