Kim would initially be in shock but quickly shift to her problem - solving mode. She would assess the situation and start formulating a plan. Ron would be freaking out a bit, but he would also try to make light of the situation with his humor. Rufus would be exploring and might accidentally stumble upon some key information about the Chaos Gods. Meanwhile, Bonnie would probably be more concerned about how this chaos would affect her social status, but she might also end up helping Kim in an unexpected way.
Well, Serena would probably be over the moon. She's always been close to both Dan and Blair and would see this as a wonderful union. She'd be there for Blair during the pregnancy, helping her with shopping for baby clothes and giving her advice. Nate, on the other hand, would be more practical. He'd offer to help Dan with any financial or housing arrangements they need to make for the baby. And then there are the more catty friends, like Penelope and Hazel, who might be jealous and make snide remarks about how Dan and Blair got pregnant so quickly, but deep down they're just envious of their relationship.
He probably gets really protective. Jack might immediately rush to her side and check on her injuries. He'd be worried sick and would want to make sure she gets proper medical attention right away.
Sukuna does die in the manga. The way it happens is quite dramatic and ties in with many other elements of the story, adding depth and tension to the overall narrative.
Nope. Ryomen Sukuna has no basis in reality. It's a product of the creative minds of the writers and illustrators who designed a captivating fictional character for the enjoyment of the audience.