The Salvatore brothers might be a bit protective at first. Damon would probably be skeptical about Kol being in the picture, but over time he'd warm up to the idea for Elena's sake. Stefan would be more accepting right away and offer his support. Bonnie would be excited and use her magic to make sure the baby is safe. Caroline would be all over helping with baby clothes and advice. As for the Mikaelson family, Klaus might see the baby as a way to strengthen his family's hold in the supernatural world, but also be protective in his own way.
Caroline would probably be very shocked at first. She might have some concerns about Kol's intentions, but seeing how much he loves Elena and how excited they are about the baby, she would gradually come around. Stefan would be more reserved in his reaction. He would be worried about Elena getting hurt, but he would also respect her decision. Damon, on the other hand, would be more vocal. He might make some snide remarks at first, but deep down he would also want Elena to be happy. Bonnie would be practical. She would offer to use her magic to make sure Elena has a safe pregnancy and that the baby is healthy.
Sakura would be overjoyed. She's been Naruto's friend for a long time, and she would be excited to see him start a family. She might offer to be the baby's doctor and make sure the baby is healthy. Shikamaru would probably be a bit lazy about it at first but would come around and offer his strategic mind to help protect the baby if needed.
Stefan might be initially shocked but then be very supportive. He would probably offer to help in any way he can, like babysitting or giving advice based on his own experiences. Bonnie would be excited and use her magic to create some special things for the baby, like a protective charm.
Caroline would probably be overjoyed and very helpful. She might offer to babysit all the time and give parenting advice based on her own experiences or what she's read. Damon, on the other hand, might be a bit more cynical at first, but eventually grow to love the baby and become very protective.
Grover would probably be really excited. He might bring all kinds of nature - related gifts for the baby, like a special plant that has protective powers. He would also be very protective of the baby, using his nature senses to detect any danger.
Ban would probably be excited and start thinking about all the fun things he could teach the baby, like how to steal food without getting caught in a humorous way. King might be a bit more reserved at first but then offer to make the most beautiful crib with his powers. Diane would be super excited and offer to babysit all the time, cooing over how cute the baby will be.
Their friends would probably be really surprised at first. Orihime might be super excited and start making all kinds of baby clothes and accessories for them. Chad would be happy for them in his quiet way, and Ishida might be a bit more reserved in his reaction but still offer his support.
Their friends would probably be really excited. They might bring over gifts like cute baby clothes or toys. Some friends could offer to babysit so Aphmau and Aaron could have some time to themselves.
Blair would probably be a mix of shocked and a bit jealous. She has always had a complex relationship with Serena and Nate, and this new development would surely stir up her emotions. Chuck might see it as an opportunity to manipulate the situation for his own gain or use it to taunt Nate. Dan would likely be judgmental at first, but then he might come around and offer some practical advice. Jenny could be either excited or use it as a way to gain more popularity in the Upper East Side drama.
Their friends would probably be really excited. Some might bring over baby gifts like cute little outfits or toys. Others could offer to babysit so that Zoe and Wade can have some time for themselves.