Well, without more details, it's difficult to tell the exact 'Brockton, Massachusetts horror story'. It could involve something like a series of unexplained disappearances in the area. Maybe there were rumors of a deranged killer on the loose in Brockton at some point in history, which would definitely make for a terrifying story. Or perhaps there are old, abandoned buildings in Brockton that are said to be haunted by the spirits of those who met a tragic end there.
One possible element is the idea of a cursed location. Maybe there's a particular spot in Brockton where bad things always seem to happen. It could be an old well or a grove of trees. Also, the story might include elements of the supernatural such as witches or warlocks who once practiced in the area. And then there could be the element of a lost soul, someone who died under mysterious circumstances and now haunts the town seeking revenge or closure.
One possible plot could be Harry arriving in Brockton Bay and using his magic to clean up the city. He could start by using spells to get rid of the gangs' illegal hideouts and weapons. Then, he might use his knowledge of potions to create antidotes for the drugs that are ruining the lives of the locals. His presence would also attract the attention of local heroes and villains, leading to various confrontations and alliances.
The Slaughterhouse Nine could be the main villains. Their sadistic and unpredictable nature would pose a huge threat to Harry. Each member has their own unique and terrifying power. Harry would have to rely on his magical knowledge and any allies he can make in Brockton Bay to survive and stop the Nine from causing more chaos in the city.
I'm not that familiar with her, but she must be the central figure in this story. Maybe she was someone who went through an extraordinary event related to judgment.
Ellie could be a new superhero in training. Maybe she has some sort of power related to energy manipulation. She looks up to Peter and Wade and wants to learn from them. So she gets involved in their adventures and gradually becomes an important part of their team.
There's not enough information given to really know who Kevin Will is in the 'end of watch the kevin will story'. He could be anyone. He might be a character in a fictional story, in which case his identity could be shaped by the plot. For instance, if it's a mystery story set around a night watch, he could be the detective or the person who holds the key to solving the mystery. Or if it's a more personal story, he could be someone going through a life - changing experience during his watch. But all of this is pure speculation at this point.
Kevin Cummins might be an individual with a passion for storytelling. Maybe he is someone who uses his stories to convey important messages, entertain people, or preserve a certain culture or tradition. Without more context, it's difficult to say exactly who he is.