Mandy is one of the 3 main characters. She managed to win over the Grim Reaper as a friend in a game of supernatural limbo (ep.1). She is friends with Grim the Grim Reaper and sorta friends with Billy, another boy who was involved with the bet involved with the limbo game. In other words, no, she is not the Grim Reaper. But she is the toughest in the group.