Nami would probably be shocked at first. She might worry about how this would affect Luffy's journey to become Pirate King. But then she would likely start thinking about practical things like how to take care of the baby on the ship. Sanji would be over the moon, seeing it as an opportunity to cook for a new little life. He might also be a bit jealous that it's Luffy and not him having a baby with Hancock.
The Straw Hats as a whole would initially be taken aback. But they are a family, and they would quickly come around. They would start making plans for the baby's future on the ship, like building a little nursery area. Usopp might start making up wild stories about the baby being a super - hero - in - the - making. And Brook would be singing lullabies to the unborn baby, creating a warm and fun atmosphere on the ship.
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.
Rick would probably be very protective. He would see the baby as a symbol of hope in their post - apocalyptic world. He might offer extra protection around their living area and ensure they have enough supplies for the baby.
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.
Then there are those friends who might be jealous. Maybe they've been trying to have a baby themselves and haven't been successful. So instead of being happy for Emma and Neal, they act a bit cold or distant at first. But as time goes on and they see how much love and care Emma and Neal are putting into raising the baby, they come around and become more supportive.
The Straw Hat crew would probably be very surprised at first. Nami might worry about how Hancock's presence would affect their finances, since Hancock is used to a more luxurious lifestyle. Usopp would be in awe of Hancock's beauty and powers. Chopper would be excited to have Hancock around, as she could potentially teach him about different kinds of medicine from Amazon Lily. Zoro might be a bit skeptical at first but would come to accept it as long as Luffy was happy.
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.
Their pirate friends would probably be both excited and a bit clueless. Jack Sparrow might try to give the baby some 'unique' gifts like a small piece of treasure or a strange trinket. Gibbs would offer practical advice on how to keep the baby safe on a ship if they ever take it to sea.
Some of their friends might be overjoyed. They could offer to help with things like babysitting or bringing over home - cooked meals. Others may be a bit surprised, especially if Jack and Sally hadn't been trying for a baby for long. There could also be friends who are jealous, seeing Jack and Sally start a new chapter in their lives while they may be in a different situation.
Ross would probably be really shocked and a bit jealous at first. He might have a hard time accepting it. Phoebe would be super excited and would probably offer to be like a spiritual guide for the baby. Chandler would make a lot of jokes about it, but deep down he'd be happy for them. Monica would be practical and start planning things like baby showers and making sure Rachel has all the right things for the pregnancy.
There could be friends who are initially shocked. They might not have expected Ichigo and Senna to start a family so soon. But after the initial surprise, they would come around and offer their congratulations. Maybe they would even share their own experiences of having children or being around pregnant friends.