This specific trope within Harry Potter fan fiction portrays Daphne Greengrass, a Slytherin student often depicted as aloof and mysterious in canon, as a guardian figure for Harry Potter. This dynamic can manifest in various ways, from subtle acts of assistance and guidance to outright defense against threats, both magical and mundane. An example might be Daphne intervening to prevent Harry from being bullied or using her cunning and knowledge of Slytherin’s inner workings to protect him from more insidious plots. This portrayal often explores themes of found family, unexpected alliances, and the complexities of inter-house relationships.
The popularity of this characterization stems from a desire to explore alternative narratives and relationships within the established Harry Potter universe. It offers a fresh perspective on both Daphne, who is largely undeveloped in the original series, and Harry, by placing him in a dynamic that diverges from his usual Gryffindor-centric support system. Furthermore, it allows authors to delve into the nuances of Slytherin house, often challenging stereotypical portrayals of its members as uniformly antagonistic. This exploration can lead to richer character development and complex interpersonal relationships, adding depth to the pre-existing world.