Shino might be a bit surprised at first but then be very supportive. He'd probably offer his knowledge of bugs to help in any way he could, like using certain bugs to detect any potential problems during the pregnancy. Naruto would be over - the - moon excited. He'd constantly be checking in on them, bringing over food and just being his usual exuberant self. Sakura would be the practical one, offering medical advice and making sure Hinata is taking proper care of herself during the pregnancy.
Well, their friends would have a range of reactions. Neji, if he were still alive, would be very protective of Hinata. He'd make sure that Kiba was treating her right and that she had everything she needed. Tenten would be excited and would probably start making baby weapons or toys in anticipation. And Kurenai, as Kiba's former teacher, would be like a mother figure to Hinata during the pregnancy, guiding her through the process and sharing her own experiences.
Naruto would probably be shocked at first. He might not have expected Hinata to leave him for Kiba. He could be angry at himself for not noticing Hinata's unhappiness sooner.
His friends would be really happy. Shikamaru would probably be like 'Well, it was bound to happen eventually, Naruto.' and offer some practical advice. Choji might bring over some delicious food for Hinata to help with her pregnancy cravings. Kiba would probably joke around with Naruto about how his life is really changing now.
Shikamaru would likely be lazy about getting involved at first. But if it started to cause a big ruckus in the village or among their group of friends, he'd step in. He'd probably analyze the situation quickly and try to find a logical solution. He might tell Naruto to cool off and Kiba to stop provoking Naruto if that was the case.
Sakura would be really happy for them. She has seen Naruto grow and has always wanted him to find true love. Since she has moved on from her old feelings for Naruto, she would be supportive and might even offer to help with the wedding preparations. Shikamaru would probably be a bit lazy about it at first, but deep down he'd be glad for Naruto. He'd say something like 'What a drag, but if it makes you happy, Naruto.' Kiba would be excited, especially since Hinata is his teammate. He might tease Naruto a bit about finally getting the girl.
Naruto would be extremely hurt. He loves Hinata deeply and to find out she cheated with Kiba would be a huge blow to him. He might go into a state of shock and disbelief at first.
Their friends would be overjoyed. Sakura would probably be really excited and offer to help Hinata with any medical advice during the pregnancy. Shikamaru might give Naruto some practical advice on how to handle the added responsibilities. Kiba could be really happy and joke around about the new baby being a future ninja partner for his own pups. And Ino would be eager to plan a baby shower for Hinata, full of beautiful flowers and gifts.
Naruto would probably be super excited and offer all kinds of help. He might bring over some of Hinata's home - cooked meals for Ino. Sakura would be very practical, offering her medical expertise and making sure Ino is having regular check - ups. Shikamaru would be more laid - back but still offer some sage advice about the responsibilities of parenthood.
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.