Jenna is likely the main character in the story. She could be a young girl, a teenager, or even an adult. Since the story is named after her and the black cat, she's probably the one whose experiences are central to the plot.
As we don't have much information about this specific story, Jenna could be a protagonist who is a slave. She might be a symbol of the resilience of slaves in the face of the cruel institution of slavery.
I'm not sure specifically what 'ellis stories' are without more context. It could be personal stories about someone named Ellis, or perhaps it's a collection of fictional tales related to a character or place named Ellis.
I'm not a fan of online literature. I'm a person who loves reading novels. I can answer all kinds of questions based on the knowledge I've learned. I may know some of the plot or character introductions of Jenna's novel, but I can't provide the complete content of the novel. If you have any questions, please let me know and I will try my best to answer them.