I'm not sure specifically as the 'the secret goldfish story' isn't a widely known common tale. It could be about a goldfish with some sort of hidden quality or a secret related to it, like maybe it has a magical power that only the owner discovers, or it could be about a secret that the goldfish is hiding from the people around it.
Since I don't know the details of the story, I can only guess. There's probably the goldfish itself as a main character. And there might be a person, perhaps a child or an old man, who discovers the goldfish or has some sort of relationship with it.
It's possible that an old man is the main character. Maybe he has been alone for a long time and the goldfish becomes his only companion. And through the relationship with the goldfish, he learns some important life lessons.
Well, it might be about a special goldfish that has some sort of secret. Maybe it can talk but only to a particular person. For example, a little girl discovers that her goldfish can give her advice on how to deal with her school bullies.
The main characters might include the person who discovers the secret goldfish. This could be a child, as children are often the protagonists in short stories about strange or magical things. There might also be a villain - someone who wants to use the goldfish for their own gain. And of course, the goldfish itself could be considered a character in a sense, as it has its own secrets and behaviors that drive the story.
I haven't read this short story in detail. But generally, when analyzing a short story, we can start from the characters. Maybe there is a special character related to the secret goldfish. The plot might revolve around how the goldfish becomes a secret and what events are triggered by it.
Not having read 'the secret goldfish short story', it's hard to say exactly. However, typical characters in such a story could be the person who discovers the goldfish's secret. This could be a young person full of curiosity. There might also be a antagonist of sorts, someone who wants to keep the goldfish's secret hidden for their own reasons. And of course, the goldfish itself could be considered a main character in a sense, as it is the center of the secret.
In many short stories, the 'secret' is a key element that drives the plot. For 'the secret goldfish short story', it could be about a hidden truth regarding the goldfish. This could involve the origin of the goldfish, a magical or unusual property it has, or a connection it has to other characters or events in the story. The story may then explore how the discovery of this secret affects those involved.
Since I haven't actually read the story, I can't say for sure. But it's likely that there is a character who owns or discovers the secret goldfish. There might also be other characters who are affected by the existence of this secret goldfish, such as family members or friends.