One can expect a focus on the characters' growth. Finn might have to grow up quickly and become more responsible. Flame Princess may have to learn to control her temper even more for the sake of the baby. Also, the fanfiction could show how their families (if they have any in the story) and friends react to the news, which could add more layers to the story.
I'm not sure if there is specifically 'interesting' finn and flame princess pregnant fanfiction. It depends on different writers' creativity. Some fanfictions might focus on the challenges they face during the pregnancy, like how Finn would deal with his responsibilities and Flame Princess would handle her new state while still having her fiery nature.
In Finn and Marceline baby fanfiction, one can expect to see the exploration of new relationships. The baby would be a new bond between them, and we might see how their friendship and love for each other deepens through this new chapter. Also, expect some references to their past adventures in Adventure Time. For instance, they might tell the baby stories about their battles with the Ice King or their travels across the Land of Ooo. There could be some elements of danger too as Ooo is full of strange and sometimes menacing characters. The fanfiction could show how they protect their baby from such threats while still allowing it to experience the wonder of their world.
One common theme is adventure. Finn and Flame Princess are often depicted going on exciting adventures together, like exploring uncharted lands or fighting new monsters.
We can expect a focus on Toriel's character development during this new phase of her life. It might explore her emotions, like how she prepares for motherhood, her hopes and fears. Also, it could involve interactions with other characters from the original work, who might support or react to her pregnancy in different ways.
One possible plot could be Finn and Flame Princess building their life together in the Land of Ooo. They might face challenges like dealing with old enemies who see their union as a threat. Finn could use his adventuring skills and Flame Princess's fiery powers to protect their new family.
Love and acceptance are big themes. Finn has to accept Flame Princess for who she is, with all her fiery aspects, and Flame Princess has to accept Finn's human nature. The kiss in the fanfiction can be a moment of pure acceptance between them. Also, the theme of adventure and the unknown is there. Their relationship is always an adventure, and the kiss is a new step into the unknown for both of them.
We can expect a lot of emotions. Since Finn and Amanda are important characters, their kiss will likely be a big deal. It might be a moment of relief, like after they've been through a tough battle or a difficult situation. It could also bring out different reactions from other characters in the story, which would add more drama.
One could expect a story that challenges the norms of the original story. If Yuki and Zero are in a world with certain rules or social structures, a pregnancy could disrupt all that. It might show their journey of breaking free from those constraints or facing the consequences. There could be a lot of tender moments between them as they anticipate the arrival of their baby. The fanfiction might also play with the idea of how their powers or unique qualities interact with the pregnancy. For example, if they have supernatural abilities, how would that affect the pregnancy or the baby? And of course, there would likely be a fair amount of drama as they navigate this new chapter in their lives.
We can expect a blend of emotions and new storylines. It might explore how their relationship changes with the new development of pregnancy. There could be challenges they face together, like protecting the unborn child from enemies in their fictional world.
Well, it could be a very unique take on the Naruto universe. Maybe it would explore how their relationship changes with this new situation. It might also involve the reactions of other characters in the series, like Naruto or Sasuke.