Maybe Percy discovers a hidden power within himself that is related to Sobek. For example, he could gain the ability to control water in a more primal and fierce way, like Sobek does. He then has to learn to control this new power while facing off against an enemy who wants to use it for evil. This could lead to some intense battles and character growth for Percy.
A plot could involve Percy being sent on a mission to an ancient Egyptian underworld realm by Sobek. There, he meets various Egyptian deities and creatures. He has to use his skills as a demigod and his new powers from Sobek to navigate through the dangerous realm and return to the mortal world with important information for the safety of Camp Half - Blood.
A possible plot could be that there is a prophecy that only Percy and the Host of Sobek can fulfill. It involves finding a lost artifact that has the power to either save or destroy the world. Along the way, they face internal conflicts as their different cultures and beliefs clash, but they learn from each other and grow stronger as a team.
Annabeth could be a great ally. She's smart and resourceful, and she could help Percy figure out the mysteries related to Sobek and his Egyptian connections. Her knowledge of architecture and strategy would be useful in any quests Percy undertakes.
Another option could be a corrupted demigod. Maybe a child of a minor Egyptian god who is jealous of Percy's status as Son of Sobek. This demigod could form an alliance with some dark forces and try to undermine Percy at every turn, creating all sorts of challenges for him.
One idea could be Percy having to use his charm powers (from being Aphrodite's son) to charm a powerful, ancient monster into sparing a group of demigods. He might struggle with the morality of using such powers in this way.
Another plot could be Percy discovering a long - lost relative among the children of Hades. This relative has some sort of power or knowledge that could change Percy's understanding of his own identity and his place in the demigod world. It could lead to a journey of self - discovery for Percy as he navigates this new family connection within the dark and often misunderstood realm of Hades.
Another plot could involve Percy having to prove himself to the children of Athena. Since he's not a child of Athena, they might be skeptical of his abilities at first. But as they face challenges together, like deciphering ancient prophecies that are hidden in Athena - related temples, Percy shows his worth through his quick thinking and battle skills. This could lead to a great friendship and mutual respect among them.
One idea could be Percy exploring his new powers that come from being the son of a Titaness. He might discover abilities that are different from his normal demigod powers and have to learn to control them quickly. For example, he could have the power to manipulate time on a small scale, like slowing it down in a battle to gain an advantage.
One idea could be Percy having to team up with Leto's other children in a quest to retrieve a powerful artifact that was stolen from their mother. Another could be Percy discovering a hidden connection between his powers and Leto's domain, leading to a new level of his abilities.
One idea could be Percy discovering new powers related to being the son of Pontus. For example, he might be able to control underwater currents in ways he couldn't before. Another plot could involve him having to face a new type of sea monster that is specifically drawn to his Pontus heritage. He could also go on a quest to find an ancient artifact related to Pontus that has the power to either save or destroy the underwater world.