The combination of Jon Snow's character and the mystery of the Faceless Men. Jon Snow is a complex and beloved character from the original series. When paired with the enigma of the Faceless Men, it creates a lot of potential for interesting stories. His moral code and their amoral nature can lead to great internal and external conflicts.
One possibility is that Jon Snow uses his new Faceless Man skills to infiltrate the Boltons' camp undetected. He could change his face to look like one of their soldiers and gather crucial intelligence for the Starks.
One great fanfiction could be 'Jon Snow's New Path'. In this story, Jon Snow discovers his connection to the Faceless Men in a very unexpected way. It delves deep into his struggle with his new identity and the powers that come with it. The author does a wonderful job of blending the mystery of the Faceless Men with Jon Snow's own character arc from the original series.
As a Faceless Man, Jon Snow could have a different role in the fight against the White Walkers. Instead of leading an army openly, he could use his shape - shifting abilities to spy on the enemy. He could blend in with the White Walkers' ranks and find out their weaknesses, which would be a huge advantage for the living.
One interesting storyline could be their journey together after uniting their forces. Maybe they face a new, unexpected threat that tests their relationship and leadership. Another could be a story where they have to navigate the political intrigue of Westeros together while also dealing with their growing feelings for each other.
He could be recruited by the Faceless Men. Maybe they saw potential in him, perhaps his skills or his thirst for a new identity led them to approach him and offer him the chance to become one of them.
It's interesting because it can explore different aspects of their characters. For example, how their relationship might change if they were in different situations, like facing a common enemy or having to make difficult decisions together. It gives a new perspective on their individual personalities as well.
The uniqueness lies in the contrast it creates. Jon Snow was known for his honor and loyalty in the original story. As a vampire, these traits might be put to the test. He could be in a situation where his vampiric instincts conflict with his moral code. Also, the settings in these fanfictions can be really different. Instead of just the cold North or the political intrigues of Westeros, there could be dark vampire lairs and new, supernatural elements added to the familiar 'Game of Thrones' world.
His training at the Night's Watch. He learned from experienced men there.
One possible plotline could be Tjon Snow using his new Faceless Man skills to infiltrate enemy strongholds. He might change his appearance to gather intelligence and undermine his foes from within.
He could be a wizard who made a deal with a powerful magical entity. In exchange for great power, he lost his face. Now, he appears in the story of Harry Potter, and his presence might be a sign of a greater, more complex plot involving power struggles within the wizarding world that Harry will eventually get caught up in.