Writing fanfic that involves sexual content about a real person like Grace VanderWaal is inappropriate. It violates the person's privacy and can be considered disrespectful and unethical.
Since we lack the details of the 'Mona Darling full story', it's difficult to define who Mona Darling is precisely. She might be a protagonist in a love story, facing challenges in her relationship. Or she could be a strong - willed character in a thriller, fighting against some sort of danger. There are countless possibilities depending on the nature of the story.
Boo Radley serves as a symbol of innocence and kindness in the novel. His presence adds depth to the story and helps reveal the true nature of the characters around him.
Another theory is that it might be a composite of several different women. However, historical evidence mostly points towards Lisa Gherardini. She lived in the same time and place as Leonardo da Vinci, and the connection through her husband's commission is a significant factor.
Boo Radley's origin story is quite tragic. He was a recluse in the neighborhood. His family was strict and he got into some trouble as a young man. His father locked him up in the house for years to keep him out of trouble. This isolation led to his mysterious reputation in the town. People spread all kinds of rumors about him because no one really saw him. He became like a local legend, with kids being both scared and curious about him.