In the 'Percy Jackson Heir of Tartarus Fanfiction', the theme of identity is likely to be prominent. Percy has always been a demigod hero, but now as the heir of Tartarus, he has to redefine who he is. His loyalties might be tested as well. Does he side with the forces of good, or will the pull of Tartarus make him question his alliances? The fanfiction could also play with the idea of destiny. Is being the heir of Tartarus his true destiny, or is there a way for him to break free from this dark path? It could be an exciting exploration of a beloved character in a new and unexpected context.
Well, one aspect to consider in this fanfiction could be the character development. Percy Jackson is already a well - established character, but as the heir of Tartarus, he might face new challenges that force him to grow in different ways. Maybe he has to deal with darker powers within himself. Another point could be the world - building. Tartarus is a very dark and dangerous place in the Percy Jackson universe, so how the author expands on that and shows its influence on Percy and the story is important. Also, the relationships with other characters would be interesting. Will his friends still trust him when they find out he has this new 'heir' status? How will his enemies react?