For a fanfiction, the pregnancy could bring out new sides of their characters. Rikki might become more nurturing, which is a big change from her usually tough exterior. Zane could be more protective than ever. They could also face medical issues related to the pregnancy because of their mermaid and merman biology. They'd need to find a way to get proper medical help without revealing their secrets. They might turn to a trusted friend who has some knowledge of their world to assist them during this difficult time.
One idea could be that they discover the pregnancy unexpectedly. Maybe they're still in the midst of dealing with their powers and the challenges that come with them. Rikki could be worried about how her mermaid nature might affect the pregnancy. Zane, on the other hand, would be determined to support her no matter what. They might have to hide the pregnancy from some of their friends at first because they're not sure how to explain it, especially considering their unique situation as mermaids and mermen.
In a fanfiction plot, perhaps Rikki and Zane have been longing for a family for a while. When they find out Rikki is pregnant, it's a mix of joy and fear. They could start preparing for the baby by creating a safe space in their home. However, they also face threats from outside forces. Maybe some people who are against mermaids and mermen find out about the pregnancy and try to interfere. Rikki and Zane then have to fight to protect their unborn child and their future together.
You could start with them having a conversation about their future and wanting a family. Then, Rikki reveals that she might be pregnant. This way, you build up the anticipation before the big news and show their relationship dynamics leading up to this point.
Rikki was swimming near Mako Island when suddenly a strong current caught her. She struggled against it, but as she was pushed into some sharp rocks, she got hurt. Her friends, Cleo and Emma, quickly swam to her. They helped her back to shore. Rikki's leg was bleeding and she was in pain. They used their powers to heal her a little bit, but they knew they had to get her to a doctor. So they called an ambulance and waited nervously for it to arrive.
Another plot could be a more light - hearted one. Naruto and Sakura could be preparing for the baby's arrival in a comical way. For example, Naruto tries to build a crib but messes it up in a very Naruto - like way, while Sakura just shakes her head and laughs. They could also have friendly competitions about baby names.
One idea could be that they face challenges in their relationship due to the pregnancy. Maybe their families have different reactions. For example, Vincent's family might be overjoyed but Catherine's family could be worried about the future. They could also struggle with preparing for the baby, like finding a safe place to live. Another aspect could be how they deal with the changes in Catherine's body and mood during the pregnancy.
Rikki might get hurt during a storm at sea. The strong winds and waves could throw her against the rocks or debris in the water. For example, a large piece of driftwood could hit her and cause an injury.
One idea could be a story where Hinata discovers she's pregnant and is initially scared. Neji, being her protective cousin, steps in to support her. He could help her prepare for the baby by training her gently to keep her healthy during pregnancy. Another aspect could be how the rest of the clan reacts to the news. Some might be overjoyed while others may worry about Hinata's ability to still be a strong ninja.
One possible plot twist could be that the pregnancy is not as straightforward as it seems. Maybe there are some magical or supernatural elements involved in Bella's pregnancy that Will has to figure out. For example, it could be that an ancient spell has been cast on Bella which causes her pregnancy, and this spell has some hidden intentions or consequences that will unfold throughout the fanfiction.
One great rikki and zane fanfiction could be about their adventures in a new underwater realm. It might explore how they face new challenges together and how their relationship evolves in that setting.
You can try fanfiction websites like Archive of Our Own. There are often many stories about rikki and zane there. Just use the search function and type in their names.
One idea could be that they discover the pregnancy unexpectedly. Maybe they were on an adventure and Gwen starts feeling unwell. They then go to a healer or use some alien tech to confirm the pregnancy. This could lead to a whole new set of adventures as they try to prepare for the baby while still dealing with their usual foes.