It's hard to say. Without knowing the details of the story, the ghosts could be either evil or not. They might be misunderstood spirits, or they could be truly malevolent entities.
In the 'thirteen ghosts true story', the ghosts are based on the Black Zodiac. You have the Torso, which is one of the more prominent ones. These ghosts are not just random apparitions. They are part of a system within the story's lore. The Bound Woman is another. Their existence is tied to a complex backstory involving curses and dark magic, which is all part of what makes the story so interesting and spooky.
The story of 13 Ghosts is a spine-chilling tale where a bunch of folks find themselves trapped in a place haunted by 13 vengeful ghosts. They must figure out a way to escape while dealing with the ghosts' wrath. It's full of suspense and scares!
Well, in the origin story of 13 Ghosts, there's this guy Cyrus Kriticos who was into the supernatural. He managed to find and capture these 12 really spooky ghosts. Each ghost has a unique and often quite dark origin. For example, some were victims of terrible crimes and became vengeful spirits. Then there's the 13th ghost which has a connection to the Kriticos family's secrets. It's a complex story full of mystery and horror.
Ghosts can be used to represent the past or unfinished business. For example, in many stories, a ghost might be haunting a place because of some wrong that was done to it in the past, and its presence forces the living characters to confront that history.