Nate could be a great addition. He could be a confidant to either Chuck or Blair, and his own storylines could intersect with their married life. For example, if he gets into a business deal that affects Chuck and Blair's business.
One popular Blair Waldorf pregnant fanfic might be 'A New Chapter for Blair'. It could explore how her pregnancy changes her relationships within the Upper East Side clique. Another could be 'Blair's Maternity Journey' which might focus on her personal growth during pregnancy.
You can try fanfic websites like Archive of Our Own (AO3). It has a large collection of fanfics from various fandoms, and there's a good chance you'll find Blair Waldorf pregnant fanfics there.
For a Chuck and Blair fanfic to be the best, it needs a compelling plot. It could be about them facing external threats to their relationship, like family interference or social scandals. Also, the dialogue should be on point, sounding like something they would actually say in the show. The chemistry between them in the fanfic should be palpable, just like in the original series. A fanfic that can make you feel their love, anger, and longing is a great one.
I'm not sure who Chuck Blair is specifically. There could be many people named Chuck Blair. Maybe he's an ordinary person with a personal love story that only his close friends and family know about. Without more context, it's difficult to tell the exact love story.
One popular 'Chuck and Blair baby fanfic' might be one where the baby brings them closer together as a couple. Maybe it shows how they navigate parenting in the Upper East Side drama-filled world.
One common theme is redemption. Chuck often has a bit of a troubled past, and in these fanfics, his act of comforting Blair can be seen as a step towards redeeming himself. Another theme is the power of love and friendship. Despite their complex relationship, they come together to support one another.
You can start by looking on popular fanfiction platforms such as FanFiction.net or Archive of Our Own (AO3). Just type 'Chuck Blair married' in the search bar and see what comes up. But again, if this is a very specific or less - known concept, you might not get many results immediately.
I'm not sure which specific 'Chuck Blair' you are referring to. There might not be a very well - known 'Chuck Blair' in mainstream media. If it's a more niche or original character created within a certain community, it would be difficult to recommend without more context. You could try searching on specialized fanfiction websites like Archive of Our Own (AO3) and use relevant tags to find stories related to this 'Chuck Blair' marriage.