Well, the idea of a foreign prince coming to Westeros is quite popular. He could be from Essos, with different customs and beliefs. His arrival shakes up the power dynamics as the houses either try to use him or get rid of him. Then there's the grizzled veteran soldier. He's seen many battles and has a wealth of stories. He might be a mentor to a younger character or be trying to find a peaceful end to his days after a life of war. Also, the self - made merchant is an interesting male OC concept. He has no noble blood but has amassed a great fortune through his wits and business acumen. He gets involved in the politics of Westeros because he wants to protect his business interests or gain more power through alliances with the houses.
Jon Snow - like ocs are quite popular. They are often strong, brooding characters with a sense of honor and a complex backstory. They might be outcasts in society, just like Jon was as a bastard, but have great potential.
One popular 'Game of Thrones' fanfic could be those that focus on alternative endings. For example, fanfics where Jon Snow manages to unite the Seven Kingdoms in a more peaceful way than in the original series. Another type might be ones that explore different relationships, like a deeper look into the friendship between Arya and Gendry that could have developed into something more.
I think it could be the blacksmith OC who has a strong moral code. For instance, an OC who refuses to make weapons for evil lords or sells his work only to those who he believes will use it for good. This type of character adds depth to the fanfiction and can be very appealing to readers who like complex and morally upright characters.
One interesting concept is the self - inserted character changing the course of major events. For example, they might prevent the Red Wedding, which was a tragic and pivotal moment in the original series. This alteration can lead to a completely different power dynamic in Westeros.
One interesting concept could be a crossover with a character from a different fantasy universe. For example, bringing in a powerful mage from another world into the Game of Thrones setting. This can create unique power dynamics and storylines as they interact with the existing characters like Jon Snow or Daenerys. It can also introduce new magic systems that might clash or blend with the magic already present in Westeros.
A popular OC could be a modern journalist. In the fanfiction, they travel through Westeros documenting the events, much like a war correspondent. Their fresh perspective and modern writing style make their accounts very interesting to both the characters in the story and the readers. They might also have a blog in the modern world that somehow links to the 'Game of Thrones' universe, and fans from our world follow their adventures.
A popular OC could be a warrior who has a lemon - shaped amulet. This amulet is said to give him special powers in battle. He is from a small house that has long been associated with lemons in the fanfiction. His story could involve him fighting in various battles, using his amulet's power to defeat his enemies. He might also get involved in the larger power struggles between the big houses of Westeros, all while his lemon - amulet remains a central part of his identity.
One popular BuzzFeed Game of Thrones fanfic might be those that focus on alternative endings for characters. For example, a fanfic could explore what would have happened if Jon Snow had decided not to go to the Wall. Another type could be about the relationships between characters in more depth, like a detailed exploration of the friendship between Tyrion and Varys.
Obviously, Loras Tyrell is a main character in most. In some fanfics, Margaery Tyrell also plays a significant role as his sister. They often have deep conversations about the family's political strategies. Another common character is Renly Baratheon, as Loras was his sworn shield. Their relationship is explored in detail in many fanfics.
Most official platforms do not allow the existence of erotic fanfics related to 'Game of Thrones' due to content regulations. It's better to focus on the official and family - friendly aspects of the 'Game of Thrones' story, such as its complex political intrigue and character development.