Jon Snow is often included. His connection with Daenerys in the original series makes him a popular addition in fanfiction. He might team up with Daenerys to fight a common enemy or have a more complex relationship with her.
Well, a simple idea could be that the pregnancy is a secret at first. Only a few close allies know. Jon and Daenerys have to be very careful to keep it that way. They might have some close calls where the secret almost gets out, adding a lot of tension to the story.
Another plot could be that the baby is prophesied to bring great change to the world. Daenerys then has to navigate how to raise the baby in a way that fulfills this prophecy. She might face many challenges and difficult decisions along the way.
One interesting plotline could be Daenerys using her dragons to discover a hidden, ancient civilization. The dragons might lead her to a lost city filled with magic and secrets.
She develops a sense of justice, especially when it comes to slavery. She is horrified by the institution of slavery in Slaver's Bay and takes it upon herself to end it. This shows her growth from a self - focused exiled princess to someone who cares about the greater good.
Sometimes, characters like Arya Stark are paired with Daenerys. Arya's skills as an assassin could be used to eliminate key targets in Daenerys' revenge plan. Their combined strength and determination would make a formidable force against their enemies.