Another theme is relationship dynamics. The age - switch often alters the relationships between characters. Friends may act differently towards each other. For instance, Ron might be more protective of a younger Hermione if she is in a much younger form than she should be.
One common theme is the clash of different magic systems. Harry Potter has its own set of spells and magic types, while Dragon Age has its unique magic like blood magic. Fanfictions often explore how these two different magics interact when the worlds collide.
One popular 'Harry Potter age - switch fanfiction' is 'The Time - Turner Twist'. In this fic, Hermione accidentally activates a modified Time - Turner that not only sends her back in time but also switches the ages of the main characters. It's really interesting to see how the young - again adults interact with the younger versions of their friends.
A common theme is the clash of magic systems. The magic in Harry Potter is different from that in Dragon Age, so seeing how they interact is a big part. Another theme is the cultural differences. Hogwarts has its own culture and so does Thedas.
One common theme is the exploration of relationships. When a character like Harry has a mental age regression, it changes how he interacts with his friends and enemies. For example, his friendship with Ron and Hermione might become more protective on their part.
Harry and Draco are quite common. Their contrasting personalities and the whole Gryffindor - Slytherin rivalry make it an appealing combination for body - switch scenarios.
One main theme is the clash of cultures. The civilized magic world of Harry Potter against the more barbaric Hyborian Age. Another could be survival, as characters from the Potter universe might have to adapt to the harsher conditions of the Hyborian Age.
One common theme is legacy. It often shows how Harry's actions throughout his life have left a lasting mark on the wizarding world, and as he dies of old age, he sees the fruits of his labor in the new generation.
One common theme is the exploration of different life experiences. For example, if there's a significant age difference, the younger character might be more naive while the older one is worldly. Another theme could be the idea of mentorship turning into a romantic relationship, like the older character guiding the younger in the ways of the music industry (since Harry Styles is in the music world) and then feelings evolving. Also, there can be themes of facing judgment from others due to the age gap, which adds drama and conflict to the fanfiction story.
Love and sacrifice are also prevalent themes. We see how the love of Lily Potter saved Harry in the original series, and fanfiction often expands on this idea of love being a powerful force. There are also fanfictions that explore the idea of redemption for characters like Draco Malfoy, showing that even those on the wrong side can have a chance at changing and making amends.
One common theme is adventure. Combining the action - packed world of 007 with the magical adventures of Harry Potter makes for some thrilling stories.