Well, a plot twist could be that Shego's pregnancy has some sort of unexpected side effect on her powers. For example, her powers could become unstable or she could gain new powers. This would change the power dynamic between her and Ron, and also add an interesting element to the story as they try to figure out what's going on with her abilities while dealing with the pregnancy.
One possible plot twist could be that Ron initially panics about the pregnancy but then realizes he has strong feelings for Shego. Maybe he tries to keep it a secret from their respective friends and enemies, which would lead to a lot of sneaking around and near - misses of being discovered.
Perhaps a plot twist could be that Shego's powers start to change after the marriage. Maybe she loses some of her powers but gains new, unexpected abilities. This could cause her to feel insecure, and Ron would have to support her through this difficult transformation, all while they face new threats that are attracted to her new powers.
Well, a plot twist could be that the pregnancy is not as straightforward as it seems. Maybe there's some sort of magic or science - fiction element involved. For instance, the baby could have some superpowers that start to manifest even before it's born. This could attract the attention of various factions, both good and bad. Ron and Shego would then have to navigate through these new threats while also dealing with the normal pregnancy issues. Or perhaps, the pregnancy was caused by an accidental encounter with a strange artifact, and now they have to figure out how to ensure the baby's health while also finding a way to reverse the effects of the artifact if necessary.
One possible plot twist could be that their respective families oppose the marriage at first. Maybe Kim's family is worried about Shego's past as a villain. But then, through a series of adventures together, the families come to realize that they truly love each other and are good for one another.
One possible plot twist could be that the pregnancy is not as straightforward as it seems. Maybe there are some supernatural elements involved, like the baby having special powers. For example, the baby could be a key to a different realm or have the ability to manipulate time. Another plot twist could be that there are enemies who want to harm Chloe because of the pregnancy, adding a lot of action and suspense to the fanfic.
One possible plot could be that Shego, who has always been a villain, starts to see Ron in a new light. Maybe she first gets close to him out of curiosity because of his relationship with Kim. As she spends more time with Ron, she realizes his kind heart. And when she discovers he's going to be a father, she's drawn to his new sense of responsibility and falls in love.
Perhaps in this fanfiction, Ron and Bonnie are happily married but then Shego shows up pregnant. It could turn out that the baby has some sort of special power or connection to their world. Ron, with his experience in dealing with strange situations, might take it upon himself to protect Shego during her pregnancy. Bonnie could be initially jealous or suspicious but then grows to care for Shego as they realize they are all in this together. And the story could revolve around their journey to discover the origin of the baby and keep it safe.
Another plot twist could be related to the pregnancy itself. What if Sakura's pregnancy was not a natural one but rather the result of some kind of experiment or curse? This could lead to a whole adventure where she has to find a way to break the curse and save her unborn child. She might have to team up with unlikely allies and face powerful enemies in the process.
One possible plot twist could be that the pregnancy is not a normal one. Maybe it's part of some alien experiment or a time - related anomaly. For example, the baby could have special powers that are both a blessing and a danger. Another twist could be that the Doctor has to make a difficult choice between saving Amy and the unborn child in a life - threatening situation.
One possible plot twist could be that Caroline initially tries to keep it a secret from Klaus. She might be afraid of how he'll react or what it means for their complicated relationship. But then, circumstances force her to tell him, like a threat from an enemy who somehow finds out about the pregnancy.
One possible plot twist could be that Hancock has to hide her pregnancy from the outside world for the safety of Luffy and their unborn child. Maybe there are enemies who would target them if they knew. Another could be that Luffy has some strange reaction to the news of becoming a father, like initially being really confused but then growing into the role in an unexpected way.