As I'm not sure about the 'Anjali the Friendly Ghost story', but typically in such a story, Anjali would be the central character. And there could be other characters such as the people in the place where she haunts. It could be a homeowner who discovers Anjali's presence, or a neighbor who has also heard about the strange happenings related to Anjali. There might also be a character who is initially scared of Anjali but later realizes she is friendly.
I don't really know the exact main characters in the 'Anjali the Friendly Ghost story'. However, if we follow the common pattern of ghost stories, Anjali, the friendly ghost, is surely a main character. There may be a group of kids who are curious about the spooky things in their neighborhood and end up meeting Anjali. Or perhaps there is an old caretaker of a building where Anjali resides. These characters could play important roles in the story, either as those who befriend Anjali or those who initially misjudge her.
Since I don't know the story well, I can only assume that Anjali is the main character as she is the friendly ghost. There might also be some people she interacts with, like the family or friends who encounter her.