Common themes in 'naruto dragon priest fanfiction' include the idea of destiny. The presence of the dragon priest is seen as something fated in many stories, and characters must fulfill their destinies related to it. Also, the theme of transformation is quite prevalent. As characters interact with the dragon priest or its powers, they often undergo physical or mental transformations. Additionally, there is often a theme of mystery, as the origin and true nature of the dragon priest are explored.
One common theme is power. The dragon priest often brings a new level of power to the Naruto universe, and the story may revolve around how characters handle this newfound power. Another theme is the clash of cultures. Since the dragon priest concept is not native to Naruto, there's often a exploration of how it fits into the existing ninja culture.