One common theme could be self - discovery. Keith might be exploring his sexual identity and coming to terms with being gay. Another theme could be love and relationships, perhaps his journey in finding a romantic partner.
One popular one might be 'Bond Beyond Battle' which delves deep into their relationship, showing how they support each other in different scenarios. It has great character development and a really engaging plot.
I'm not sure specifically which 'Keith is gay fanfic' is really good. You could try searching on some well - known fanfic platforms like Archive of Our Own. They have a wide variety of fanfics and you might be able to find some interesting ones related to this topic.
You can start by searching on popular fanfic websites like Archive of Our Own. Just type in 'Keith and Lance' and then filter the results for the relationship type you're interested in. There are usually a lot of great options there.
Keith will likely be defiant. He has a strong sense of justice and will not be easily broken by Zarkon. He might try to fight back immediately if he has the chance.
One of the main characters could be Shiro. Shiro has always been like a big brother to Keith. So when Keith turns into a girl, Shiro would be there to help him adjust. He'd make sure Keith is safe and comfortable in his new form. Also, Hunk could be a main character. Hunk would probably be the one to offer emotional support and cook some comfort food for Keith during this tough time of adjustment.
I'm not sure if there is a specific 'pregnant Keith fanfic' available. It depends on the fandom and the amount of fan - created content out there. You could try searching on popular fanfic websites like Archive of Our Own or FanFiction.net.
I think Keith's closest friends within the blades are most affected. If he's younger, they might become more overprotective. If he's older, they could start relying on him more for advice. For instance, if there's a character named Lance who was previously on equal footing with Keith, now he might see Keith in a different light depending on his age.