It's possible that the child has a combined power. Maybe they can use water to create structures, a blend of Percy's water control and Annabeth's architectural knowledge. Also, they might have a special form of telepathy that only works with other demigods related to Poseidon or Athena, allowing them to communicate and strategize better in battles or difficult situations.
The kid could have the power of hydrokinesis from Percy, being able to control water in various ways like creating water spouts or walking on water. And also inherit Annabeth's intelligence which could be manifested as the ability to quickly analyze battle situations and come up with winning strategies.
In such a fanfiction, the kid might inherit their parents' special abilities. For example, having Percy's water - controlling powers and Annabeth's strategic mind. Maybe the story could be about protecting the kid from various mythological threats that target the child due to its powerful lineage.
One challenge could be office gossip. People might start talking if they notice Percy and Annabeth getting too close. This could create a difficult work environment for both of them. Another challenge is the power dynamic. Percy has to be careful not to abuse his power as a boss when it comes to his relationship with Annabeth.
Another possibility is that the baby has a combined power. It could use water to create illusions, a mix of Percy's water control and Annabeth's strategic thinking. So when in a fight, it could create false images of itself using water to confuse the enemy and then attack from an unexpected angle.
Well, considering Spiderman's powers, the kid could inherit his spider - like abilities such as wall - crawling, super strength that allows him or her to lift heavy objects with ease, and the spider - sense which warns of danger. From Black Cat, the kid might inherit her cat - like grace and agility, which would make the kid extremely nimble. Additionally, there could be a unique power that combines the two, like the ability to turn invisible in the shadows, similar to how Black Cat can blend into the darkness, but with a spider - web like texture when it happens.
He might have more water - based powers related to the ocean's depths. Since Amphitrite is a sea goddess, Percy could have an even greater control over the ocean currents and the creatures that live in the very deep parts of the sea. He could also have the ability to communicate with different sea species that are more closely associated with Amphitrite's domain.
He could have the power of lightning, like Zeus. Maybe he can control it better than other demigods. Also, he might have enhanced strength and speed, similar to Zeus's own capabilities.
It could be Chiron, the centaur. He's always keeping an eye on the campers and would likely be concerned if he caught them up to something. He might give them a stern talking - to and some extra chores as punishment.
There could be a secret passageway in the school that leads to an ancient mythological place. Percy and Annabeth discover it by accident. Percy is excited to explore but Annabeth warns him to be cautious. They enter together, facing various traps and puzzles inside. Along the way, they might meet some minor gods or spirits who are either helpful or try to hinder their progress. This adventure would test their skills and teamwork, just like their quests in the original stories.
It could be a symbol of Percy's growth and maturity. His physical development might represent his journey from being a young demigod to a more confident and capable one.
It could signify trust. Annabeth trusts Percy enough to be in such an intimate physical position. It shows that she feels safe with him.