Well, Stefan would likely be the voice of reason. He'd be cautious about Kai's role in the pregnancy but would also try to encourage Bonnie to make the best decisions for herself and the baby. Jeremy could be angry at first, thinking Kai has taken advantage of Bonnie. But as time goes on, he might see that Kai is actually trying to do the right thing. And the other witches in Bonnie's life might be divided. Some would see the pregnancy as a sign of new magic potential, while others would fear the chaos Kai could bring to the magical balance.
Damon would likely make sarcastic remarks at first but deep down be happy for them. He and Bonnie have a long history, and he'd come around to being supportive. Elena would be very emotional. She'd be there for Bonnie, offering advice based on her own experiences, even if they were different in nature. The other witches in Bonnie's coven might be a bit worried at first, fearing that the pregnancy could disrupt Bonnie's connection to magic or put her in danger from other supernatural forces.
Their friends' reactions would be a mixed bag. Some, like Matt, who is more on the human side of things, would be in awe of this supernatural pregnancy. He'd try to understand it from a human perspective and offer practical help like getting baby supplies from the human world. Meanwhile, the other supernatural friends would have different reactions based on their own agendas. For example, some witches might see Bonnie's pregnancy as a powerful event and either try to use it to their advantage or protect it out of a sense of duty to the witch community. Overall, their friends' reactions would add a lot of drama and support to the fanfiction story.
Nya would be very happy for her brother Kai. She would likely be there for Skylar, sharing her own experiences if she has any relevant ones. Lloyd might see it as a new chapter for Ninjago. He could be thinking about how the baby might grow up to be a great hero or play an important role in the future of Ninjago. And the other ninja would come together as a family to support Kai and Skylar through this big change.
Ron might be shocked at first. But then, being the good - hearted person he is, he would probably offer his help. Bonnie, on the other hand, could be a bit more hesitant. She might be worried about how this would affect her marriage to Ron. However, as time goes on, she would also come around and be supportive.
Elena might be a bit shocked at first but then would be very supportive. She would offer her own experiences and advice, even if they are from a human perspective. Bonnie could be worried about the magical implications of a vampire pregnancy and offer to use her magic to keep an eye on the baby's development.
Their friends might be initially shocked. Some might be overjoyed and offer immediate support. For example, those who are close to them would probably start planning baby showers and getting gifts. However, there could be some friends who are worried about how this will change their group dynamic.
Sakura would probably be shocked at first, but then she'd be supportive. She might offer her medical skills to help with Tenten's pregnancy. Shikamaru would likely think it's a troublesome situation but would also offer his strategic advice on how to handle things. Kakashi would be his usual calm self and give them some wise words about responsibility and family.
Rory would be a mix of emotions. He'd be worried about Amy, but also feel a bit left out since she's having a baby with the Doctor. River might be more understanding, given her complex relationship with the Doctor. She could offer some advice based on her own experiences with time - travel and family. The other friends like Craig might be shocked but also try to support them in their own bumbling, human way.
If we consider Percy as one of their friends, he might be a bit protective. He could offer to help with any potential threats that might come their way because of the pregnancy. Annabeth, on the other hand, would probably be very organized in her support. She could help Reyna and Jason plan for the future, like making sure they have proper financial arrangements and a suitable living space for the baby. Some of their more light - hearted friends might make jokes about how their lives are going to change completely, but all in good fun.
Gohan would be really surprised, but being the kind - hearted person he is, he would try to understand and help out. He could offer to train with them in a more gentle way to keep them fit during the pregnancy. Piccolo would be more of a silent observer, but still be there in case of any threats.