After the initial reactions, Hermione may choose to isolate herself for a while to figure things out. She would use this time to study and research, trying to find a solution to the problem with her friends. She might also look for new allies or resources within the fanfiction world to help her deal with the situation.
She might be initially shocked and hurt. Hermione is a character who values her friendships deeply, so their sudden departure would be a big blow. She could spend some time in denial, not believing that they would actually leave her.
Her friends might be initially shocked. But then they would probably rally around her. Some friends could be super excited and start planning for the baby's arrival, like getting baby clothes and toys.
Sakura could become very angry. She has been let down by those she trusted, and anger is a natural response. She might lash out at her friends or distance herself from them immediately. For example, she could say some harsh words to them in the heat of the moment.
In case they were involved in something dangerous, like playing with matches, the mom has to be firm. She should explain the serious consequences of their actions, not just scold them. For example, she can show them pictures or videos of fire accidents caused by improper use of matches. And then, she should set strict rules to prevent such dangerous behavior in the future. At the same time, she should also encourage them to be more careful and think about safety all the time.
Natsu would probably be very confused and sad at first. He's used to having Lucy around, and her sudden departure would leave a big hole in his daily adventures. He might try to convince her to come back immediately.
Star's friends would likely be a mix of helpful and confused. Since Star is from another dimension, her friends might not be entirely sure how to handle it. But overall, they would probably try their best to make her feel normal. For example, they could plan a girls' night in for Star and the female friends, with movies, junk food, and lots of girl talk.
Her animal friends like the frogs and squirrels would probably be very excited. They could gather little things for the baby, like soft leaves to make a comfortable nest or little shiny stones as gifts.
Dyson would likely be devastated. He has a deep connection with Bo, and being a werewolf, his loyalty and love for her are strong. He might go on a rampage to find out who or what is causing her to die and try to reverse it at all costs.
There could be a friend who is also secretly jealous of all the attention Alex is getting because of the pregnancy. This could cause some tension in their friendship as the jealous friend might start to act out or be less supportive than expected.