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.
Molly Pitcher was a woman who showed great courage during the American Revolutionary War. She is often remembered for taking over her husband's cannon-firing duties at a crucial battle.
Yes, there are many Sherlock Molly pregnant fanfictions. Writers like to create this scenario to see how the characters, especially Sherlock, will react to such a life - changing event. It can also be a way to explore Molly's character more deeply, as she navigates motherhood and her relationship with Sherlock.
Molly Bloom is the central figure in this true story. Without more context, we can assume she is an individual with a story worth telling, perhaps someone who overcame difficulties or had a remarkable life.
I don't have enough information to say who Molly is. She could be anyone, like a little girl, a young woman, or even an animal if it's a fictional and creative story.
Maybe there is a bully in the story. If Molly learns a lesson about standing up for herself or kindness towards others, a bully character could be present. The bully could be causing trouble for Molly or other students, and Molly's experience with the bully is what makes her learn an important life lesson at school.