Annabeth could be a strong ally. She has always been there for Percy, and even though his parentage has changed, her loyalty might still hold. Grover too. He's Percy's best friend and would likely stand by him no matter what. Another potential ally could be the Hunters of Artemis. Since Diana is another name for Artemis, they might see Percy as someone they need to protect and help, especially if he is involved in something that concerns the goddess.
Sure. 'Percy and Diana's Adventures in the Enchanted Forest' is a great one. It has an interesting plot where they team up to solve the mystery of the disappearing magical creatures in the forest.
One great 'Percy Jackson x Diana fanfiction' is 'The Meeting of the Demigods'. It has an interesting plot where Percy and Diana first cross paths during a quest. The story does a great job of portraying their different powers and personalities.
A common theme is the clash of different mythologies. Percy comes from Greek mythology and Diana from Roman mythology. Fanfictions often explore how these two different mythological backgrounds interact.
One interesting plotline could be Percy having to deal with new powers inherited from Diana. For example, he might have an enhanced connection to nature and animals, which could lead to adventures where he has to communicate with forest spirits to save his friends. Another plotline could involve Percy facing off against a new set of enemies who are specifically targeting him because of his relation to Diana. These enemies might be ancient foes of Diana's that now see Percy as a threat to their plans.
Percy Jackson's power over water could be really interesting when combined with Diana Prince's combat skills. For example, Percy could create water barriers or even water weapons for Diana to use in battle. His ability to control the sea could also be used to quickly transport them across large bodies of water during their adventures together.
One plot idea could be that Percy Jackson, while on a quest, accidentally stumbles into Diana Prince's world. They team up to fight a common enemy that threatens both the demigod and the Amazonian worlds. Maybe a powerful ancient evil that has the ability to disrupt the balance between the mortal and the divine in both their realms.
A fanfiction could focus on baby Diana's growth. Nick and Adalind are constantly amazed by how fast she is developing. Diana seems to have an uncanny ability to sense danger before it arrives. Nick starts training her in self - defense at a very young age, with Adalind being a bit hesitant at first but then realizing it's necessary for their unique family situation.
Another theme is the struggle with royal life. They had to deal with so many protocols and expectations, and fanfictions often highlight how these affected their relationship. For example, in some stories, the strict rules of the palace are shown as a major obstacle to their happiness.