One of their friends could be secretly jealous. This friend might feel left out as Zoey and Logan's focus shifts to the baby. However, through some events in the fanfiction, like Zoey and Logan reaching out and including this friend in the pregnancy journey, they would overcome this jealousy and strengthen their friendship.
Their friends might be really excited at first. They could start planning baby showers and buying cute little baby gifts. But some friends might also be a bit jealous if they've been trying to have a baby themselves.
Her parents might be shocked at first. But knowing Zoey, they would probably come around and be very supportive. They could offer to help her with any financial or practical matters. For example, her mother might come to PCA to stay with her for a while and make sure she's eating well and getting enough rest during her pregnancy.
If Logan and Quinn were pregnant in a Zoey 101 fanfiction, it could change the whole dynamic of the show. Their relationship would become more serious and they would have to grow up fast. They might start to see each other in a whole new light. And the other characters would have to step up and support them, like Chase could offer his friendship and help them get through the tough times.
Logan would likely develop from a carefree person into a more responsible one. He'd have to think about providing for Zoey and the baby. Zoey would develop more maturity as she prepares to become a mother, becoming more selfless in her decisions.
Harry and Ron would likely be very shocked and concerned. They know Fenrir is a dangerous werewolf, and they might not understand how Hermione got into this situation. They would probably try to persuade Hermione to leave Fenrir at first.
Their friends would probably be very excited at first. They might throw a surprise baby shower for Brian and Mia. Some friends could offer to help with things like setting up the nursery or giving them advice based on their own parenting experiences.
Hermione's friends from Hogwarts like Harry and Ron might be a bit shocked at first. Ron, in particular, might have some mixed feelings as he has had a bit of a competitive streak with Viktor in the past. But eventually, they would come around and support her. Viktor's friends from Durmstrang would probably be more accepting as they might respect his choice more blindly. They could be excited for him and offer their own unique magical gifts or knowledge for the upcoming baby.
Leonard would probably be really shocked at first. He's known Sheldon for so long and might not have expected him to become a father. Howard and Raj would likely be full of jokes and teasing, but also offer their support in their own goofy ways.
Caroline would likely be a mix of excited and cautious. She's a bit of a romantic at heart, so she might see the potential for a new family dynamic. However, she also knows Katherine's past and would be on guard to make sure Katherine doesn't manipulate Damon during the pregnancy. She would probably try to befriend Katherine to keep an eye on things.
Eren might be shocked at first. He has always seen Annie and Armin as comrades, and this sudden pregnancy news would be quite unexpected for him. He might be a bit hesitant but eventually come around to support them.