Daenerys Targaryen is often a common character. Given her allure and power, she can be a central figure in a harem setting. Her dragons also add an interesting element to the story.
Another common theme could be the adaptation of the 'Game of Thrones' world - building to fit the harem concept. This includes elements like the different houses and their politics being intertwined with the harem structure. For instance, a noble house might use the harem as a tool for political gain, and the fanfiction might explore how the characters in the harem respond to being used in such a way. Also, themes of survival and adaptation are likely, as the characters have to adjust to living in a harem - like environment which is often full of competition and intrigue.
Sansa Stark is a very common character to be featured. Since she had such a complex and evolving storyline in the original series, fanfiction writers love to explore different paths for her. They might write about a more powerful Sansa who takes control of the North much earlier than in the show.
Often, the strong and morally ambiguous OCs tend to be popular. They can be characters who are not afraid to break the rules and make bold moves in the world of Westeros. Maybe an OC who is a skilled fighter and strategist, and uses their harem to gain more power and influence.
Jon Snow is often a popular choice. His skills in combat and his complex backstory make him an interesting character to include in a tournament setting. He could be fighting for honor or to prove himself.
Jon Snow might be included as well. His noble and brooding nature can add an element of mystery. In a harem fanfiction, he could be the object of many characters' affections, and his presence might stir up rivalries and alliances among the harem members.
Jon Snow is also quite popular. His mysterious parentage and noble nature can be used in interesting ways in harem fanfictions. For instance, he could be a character that many in the harem are attracted to, or he could be the one who has to navigate the politics of the harem while dealing with his own destiny.
Harry is the central figure. For the Game of Thrones side, Tyrion Lannister could play a role. He might befriend Harry or try to manipulate the situation for his own gain. In terms of the harem, Cersei could be an unexpected addition. Her power - hungry nature could create a lot of drama within the harem. Also, Brienne of Tarth could be involved, perhaps as a protector or a member of Harry's inner circle.
Daenerys Targaryen is very popular. Since she was already on a journey of building an empire in the original series, fanfiction often continues or alters her path. Tyrion Lannister is also a common character. His intelligence and political acumen make him a great asset in empire - building scenarios. Jon Snow is another one. His noble background and leadership skills can be explored further in fanfiction for empire building.
Another character that might be featured is Bran Stark. His ability to warg into animals could be related to the wolves in this fanfiction. He could play a key role in understanding the wolves' new behaviors or in using their power for the good of Westeros. He might communicate with other wolf - related characters through his warging abilities.
Myrcella is obviously one of the main characters. Since it's a fanfiction centered around her, she would be the focal point of the story.