Common themes often include the ocarina as a means of connection. For instance, it could be used to connect with the magic of nature in the Harry Potter world, similar to how some wizards communicate with magical plants. Also, the ocarina might be a key element in a character's journey of self - discovery, as they learn to master its powers and in turn, understand more about themselves. Additionally, it could be part of a mystery, where the origin and true purpose of the ocarina are slowly uncovered throughout the story.
Well, a frequent theme is the ocarina's role in magic. It can be a source of power that a character has to learn to control. There might also be themes related to the ocarina being a bridge between different magical cultures within the Harry Potter world. It could be that an ocarina has been passed down through generations in a particular wizarding family and holds secrets about their heritage. Another theme could be the ocarina being used to break curses or solve problems that traditional magic in the Harry Potter series has not been able to address.