The central character is Harry Potter. In addition to him, there could be a variety of characters. There could be some sort of shadowy figures that are native to Tartarus and they teach Harry about their unique brand of magic. There might also be other humans or half - humans who have somehow ended up in Tartarus and become part of Harry's life. These characters could be either friends or foes depending on their motives and the situation in the story.
Obviously, Harry Potter himself. And there could be some dark creatures or entities from Tartarus that act as his guardians or mentors in this strange upbringing. Maybe some sort of dark wizard who has made Tartarus his lair and takes Harry under his wing.
In this fanfiction, Harry Potter is the main character. There could be demons or other dark beings from Tartarus. There might also be some original characters created to populate the world of Tartarus. For example, a powerful being that rules over a part of Tartarus and has an interest in Harry. And who knows, maybe some versions of the Hogwarts professors but with a darker twist, like a Snape who has also been influenced by Tartarus.
Well, it might involve Harry Potter growing up in a really dark and dangerous environment like Tartarus. Maybe he'd learn some very different magic or survival skills compared to what he learned in Hogwarts. He could also face different kinds of enemies, perhaps more menacing and otherworldly ones.
Obviously, Harry Potter would be one of the main characters. Since it's about him being the son of Tartarus. And probably his friends like Hermione and Ron would also be important characters as they are in the original series. They might react differently to Harry's new identity.
Obviously, Harry Potter himself would be the central character. Then, Hermione Granger could be one of the members of the harem. She is intelligent and has a long - standing friendship with Harry. Ginny Weasley is also a likely candidate as she has a romantic interest in Harry in the original series. Luna Lovegood might be another, with her unique and dreamy personality adding an interesting dynamic to the harem.
The Bones family would be important characters. Depending on how the fanfic is written, Amelia Bones could play a major role as she might be the one raising Harry. Other members of the Bones family, like cousins or aunts and uncles, could also be significant characters, influencing Harry's upbringing and his view of the wizarding world.
Annabeth could be one of the characters. She might come to Tartarus to rescue Percy or be accidentally dragged in while trying to find him. Grover could also show up, using his nature - related powers to navigate the strange and dark environment of Tartarus. Another potential character could be Nico. Given his connection to the Underworld, he may be able to sense Percy's presence in Tartarus and come to his aid.
Potential characters could include Harry Potter, of course. Then, there might be some Essos warlords who are intrigued by Harry's magic. And we could see some characters from the magical schools or hidden magic societies in Essos. There might be a young Essos girl or boy with great potential in magic who Harry takes under his wing, similar to how he mentored some of the younger students at Hogwarts.
Potential characters could range from the well - known witches at Hogwarts to those from other magical institutions. Fleur Delacour could be in the harem, given her beauty and magical abilities. And there could be characters from the wizarding world outside of Britain too. Maybe a Japanese wizard or witch who has unique magical techniques and is drawn to the Harem Lord's power and charisma.
Obviously, Harry Potter himself. Then there could be a Texan version of Hagrid, like a big - hearted rancher who discovers Harry's magical abilities. There might also be a local witch or wizard who acts as a mentor, someone with a thick Texan accent. And don't forget about the muggles in Texas, Harry's classmates at a regular school before he goes to Hogwarts. They could be curious, tough - as - nails Texans who don't quite understand Harry's strange behavior at times.
Obviously, Harry himself. Then there could be German - born wizards and witches who become his friends or mentors. There might be a strict German potions master like Snape in Hogwarts. And perhaps a German - version of Dumbledore, an old and wise wizard who guides Harry.
For the Atlantis side, there could be Atlantean royalty, like a princess or a group of elders. There might also be Atlantean mages or warriors. And don't forget about the mer - people. They could play a role, either as allies or antagonists. Maybe there's a mermaid who falls in love with Harry and helps him understand the ways of Atlantis.