I'm not sure specifically who 'Peter Brash' is without more context. It could be a common name. Maybe he's a local figure in a certain community, an artist, or someone with a personal story known only to a small group. There's not enough information here to give a detailed back story.
One possible element could be his family. Maybe he comes from a large family that influenced his values and character. Another element might be his education. If he had a good education, it could have opened doors for him in his career.
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.
Myles Kennedy is a talented musician. In 'Rise Today', his back story might be related to his journey in the music world. He has likely faced many challenges and opportunities that have shaped him as an artist. His growth as a singer and songwriter could be a part of this back story.
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.
Perhaps it's a new take on schizophrenia from Myles's perspective. It might include his relationships with family and friends during his battle with this mental illness. It could also show how he tries to find meaning and hope in his situation. For example, it may tell about his encounters with different treatments and how they affected him, both positively and negatively.