Arya Stark could also be part of the 'jon snow baby fanfiction'. She is a strong and independent character. She might be the one to train the baby in self - defense or survival skills as the baby grows up in a dangerous Westeros, with her unique skills and experiences being passed on to the next generation.
Sansa Stark might be involved as well. Given her relationship with Jon Snow as his sister (though later revealed otherwise), she could play a role in protecting or being involved with the baby. Maybe she helps raise the baby in a world where Jon Snow is constantly facing threats.
Tyrion Lannister could be involved. He was close to Daenerys and had a relationship with Jon as well. He might be the one to help protect the baby or offer his wisdom in raising the child. Another character could be Ser Davos. He was loyal to Jon and would surely be interested in safeguarding the future of Jon's heir.
Well, the dragon would obviously be a main character in its own right. It could have its own personality and motives.
Daenerys Targaryen is often paired with Jon Snow in such fanfictions. Their combined power and the potential for a different kind of relationship makes it a popular choice among writers. Another character is Arya Stark. Their sibling bond can be explored in new ways when Jon is reincarnated, like Arya helping Jon with her assassin skills in a different plot line.
Daenerys Targaryen is often paired with Jon Snow in these fanfictions. Their connection in the original series, along with their both being strong leaders, makes for an interesting dynamic. They could rule Westeros together in a new era of peace and prosperity after Jon's rebirth.
Brienne of Tarth is a character that can be paired with Jon Snow in fanfictions. Brienne is known for her loyalty and honor. She could serve as Jon's knight, protecting him and upholding justice in his kingdom. Also, Gilly could be part of the story. As Samwell Tarly's love interest and a person with knowledge from the far North, she could provide insights into the common people's needs and also help in matters related to the Night's Watch or the North in general.
Arya Stark might interact with him. She has her own set of skills and goals. Their reunion could be emotional, and they could work together to take revenge on those who wronged their family.
He could meet ancient Valyrian dragonlords. These dragonlords might still have some connection to their dragons, even if the dragons are long gone or in hiding. Another possibility is meeting the descendants of the original Valyrian slaves who have their own unique stories and skills.
Jon Snow could potentially have allies like the Mormonts. They have always been loyal to the Starks. Maybe even some of the Dornish houses might side with him. They have their own reasons to oppose the current power structure in Westeros. And of course, his friends from the Night's Watch who left with him or believe in his cause could be his allies in this conquest. He might also gain the support of some of the maesters who see the value in his leadership for the future of Westeros.
Daenerys Targaryen is often paired with Jon Snow in time travel fanfiction. Their relationship in the original series was complex, and in time travel scenarios, they could have different interactions at different points in time. For example, they might meet in the past and form an alliance much earlier.
The White Walkers could be antagonists. They pose a threat to everyone in Westeros, including Jon, Ygritte and their baby. Their icy presence could endanger the baby's life and force Jon and Ygritte to fight for its survival.