Well, a plot could be that Jon Snow as a Kingsguard is sent on a secret mission to rescue a kidnapped princess. Along the way, he meets old friends and foes from his past, and he has to use his skills and wits to overcome numerous obstacles. Also, there could be a plot where he is part of a Kingsguard that is divided in its loyalties. Some members want to support a tyrant king, while Jon and others believe in a more just rule, leading to internal conflicts within the Kingsguard.
One idea could be Jon Snow being the Kingsguard during a time of great political unrest in Westeros. He has to protect a young and inexperienced king from various assassination attempts by rival houses. Another plot could involve him having to choose between his loyalty to the king and his loyalty to his Stark family when a conflict arises between them. Maybe he discovers a dark secret within the Kingsguard that threatens the stability of the realm.
A possible plot for Jon Snow in a Kingsguard fanfiction is that he is magically bound to the king he guards. This means that if the king is in danger, Jon feels physical pain. As he tries to protect the king from a powerful sorcerer who wants to use the king's power for evil, he has to also deal with his own identity crisis. He wonders if his place is really in the Kingsguard or if he should return to the North. He also forms an unlikely alliance with a group of outcasts who have their own reasons for wanting to stop the sorcerer.
Another idea is a love - triangle - like situation. Suppose Alicent is initially attracted to a powerful lord in King's Landing, but then she meets Jon Snow. Jon's different values and his sense of honor start to draw Alicent towards him, creating a complex web of relationships and emotions. This could lead to a lot of tension and drama within the court.
One idea could be that they face challenges from their different backgrounds. Jon is from the Night's Watch and Ygritte is a wildling. Their child could be a symbol of unity between the two groups. People might be skeptical at first, but as the story progresses, they see the potential for peace through their baby.
Well, in some fanfictions, the baby could be a symbol of hope. As Jon and Daenerys' child, it represents the union of two powerful houses. The baby might grow up to be a great leader, trained in both the ways of the Targaryens and the Starks. It could bring about new laws and a more just society, learning from the mistakes of the past rulers in Westeros.
One plot idea could be Arya and Jon teaming up to uncover a long - hidden family secret. Maybe there's a lost Stark heirloom that has some sort of power, and they have to go on a quest to find it. Another idea is that they are both sent on a diplomatic mission to an unfriendly kingdom, and they have to use their unique skills - Arya's stealth and Jon's leadership - to succeed.
Another plot could involve Jon Snow's werewolf nature being related to his true parentage. What if his Stark and Targaryen blood combined in a way that made him a werewolf? This could lead to a whole new take on his destiny and role in the power struggles of Westeros.
One plot idea could be a story where Rhaella survives and somehow meets Jon Snow in secret. They could form an unlikely alliance against the threats to the Seven Kingdoms. Another could be a tale set in an alternate universe where Jon is born earlier and Rhaella plays a role in his upbringing, perhaps teaching him about his Targaryen heritage.
One plot idea could be Kagome accidentally traveling to the world of 'Game of Thrones' during a time when Jon Snow is in a great struggle. She could use her spiritual powers from her own world to help him sense approaching danger, like the White Walkers. For example, she might be able to detect their movements in a way that no one in Westeros can.
One idea could be that Jon Snow marries a wildling. Their marriage could be a way to bridge the gap between the Night's Watch and the wildlings. They might face opposition from both sides at first, but as they prove their love and commitment, they gradually bring the two groups closer together, uniting against the common threats of the White Walkers and the political turmoil in the Seven Kingdoms.
One idea could be that Jon Snow discovers he has a special bond with the dragon that allows him to communicate telepathically. He uses this to lead the dragon in battles against the White Walkers, changing the course of the war in a major way.
One idea could be that the baby is born with a special ability, like being able to communicate with dragons even more so than Daenerys. Maybe the baby's presence unites the remaining kingdoms in a way that Jon and Daenerys alone couldn't. Another thought is that the baby becomes a symbol of hope for a new era, with people from all over coming to see the new heir of the Targaryen - Stark line.