Their relationship could grow stronger. As they experience the pregnancy together, they might become more understanding of each other. For example, Luke could become more protective of Katie, and Katie could rely on Luke more, which deepens their bond.
For Katie, she could be developed by giving her more complex emotions. For example, instead of just being a meek character, she could have moments of great strength and determination. Maybe she has a secret dream that she's been too afraid to pursue until she meets Luke. Luke, on the other hand, could be developed by showing his insecurities. Despite his seemingly confident exterior, he could be afraid of not living up to his family's expectations. Their relationship could then be a journey of them helping each other overcome their respective fears.
For Katie, I could see Zendaya. She has the ability to portray a strong - willed yet vulnerable character, which would be perfect for Katie. As for Luke, Timothée Chalamet would be a great choice. He has that boyish charm and can bring out the kind - hearted and somewhat naive side of Luke that would be expected in a Cinderella - inspired story.
One idea could be that Katie and Luke are young and unexpected pregnancy throws their lives into chaos. They have to deal with family reactions, like Katie's parents being disappointed at first but then coming around. Another could be that they are in a world where pregnancy is rare, so their situation becomes a sort of miracle that the whole community gets involved in, with different reactions from envy to celebration.
A plot could involve a masquerade ball. Katie is only able to attend in a simple but beautiful dress she made herself. Luke, not knowing it's Katie at first, is immediately drawn to her. They share a magical dance. Later, when he tries to find her, he has to search through different clues. Meanwhile, Katie's step - like people try to keep her from Luke. In the end, Luke discovers Katie's true identity and they end up together.
One idea could be that Katie, instead of being a meek character like in the original Cinderella story, is a feisty artist. She meets Luke at an art exhibition where she is showcasing her work. Luke, a wealthy heir, is immediately drawn to her unique perspective. They start a friendship that slowly blossoms into love, all while Katie has to deal with her mean step - family who try to sabotage her art career because they are jealous of her growing relationship with Luke.
Yes, there might be some. Fanfiction platforms often have a wide variety of creative stories. You can try searching on popular fanfiction websites like FanFiction.net or Archive of Our Own. Just be aware that the quality and nature of these stories can vary greatly.
I haven't come across a 'Luke Gets Percy Pregnant' fanfiction myself. Fanfiction writers can come up with some really wild ideas, but this one seems rather extreme. It might not be in line with the general tone or themes of the source material. That being said, the fanfiction community is full of surprises, so it could potentially exist on some less - known platforms or in some very specific corners of the larger fanfiction world.
Perhaps Mayor Humdinger could be an antagonist. He might see Ryder and Katie's impending new family member as a distraction for the Paw Patrol and try to take advantage of the situation. He could plan some sneaky schemes to disrupt Adventure Bay while Ryder and Katie are focused on the pregnancy.
One possible plot could be that Ryder and Katie discover they are going to have a baby. They then start to prepare for the new arrival. Ryder might use his leadership skills from the Paw Patrol to organize things around the house, like building a nursery. Katie could be thinking about how to balance taking care of the baby and still being involved with the animals she loves. The other members of the Paw Patrol could also get involved, perhaps helping to babysit in the future or gathering supplies for the new family member.