Well, a cool plot could be that the Order of the Phoenix mistakes Percy for a dark wizard at first because of his ability to control water in strange ways. As they try to capture him, Percy has to prove his good intentions. Meanwhile, some of the demigod enemies see this as an opportunity to attack while Percy is distracted. And then, of course, there could be a prophecy that ties the demigods and the wizards together in this strange situation.
One idea could be Percy joining the Order of the Phoenix. He could bring his unique demigod powers to the fight against Voldemort. His ability to control water might be useful in various magical battles, like putting out dark magic - induced fires or creating water barriers.
Percy would probably be a bit of a wild card to the Order of the Phoenix members. He's used to a different kind of magic and a different set of rules. Harry might be initially suspicious of Percy but also intrigued by his powers. They could start off with a bit of a rivalry as they both try to prove themselves in different ways.
Let the characters grow and change through their interactions. If Harry and Percy become friends, Harry could learn about Percy's world and become more open - minded. Percy could also be influenced by Harry's sense of justice. This development in their relationship would make their interactions more engaging and believable.
One idea could be Percy getting involved with the Order of the Phoenix somehow. Maybe he's sent on a mission by the gods to help them out. He could use his water powers in new and creative ways within the wizarding world, like using water to put out magical fires or even to disrupt dark magic spells that rely on dryness.
Another concept could be a Phoenix being reborn as a human - like form and becoming Percy's ally. They team up to fight against a new threat that neither could face alone. The Phoenix - human hybrid could have special powers that combine the best of both worlds, and their friendship could be a central theme in the fanfic.
To make their interactions believable, start with the basic differences in their cultures. Demigods are used to a more physical, hands - on combat style, while wizards rely on magic. So when they meet, there could be some misunderstandings and even a bit of friendly rivalry. Maybe Harry could show Percy some basic spells, and Percy could show Harry how to fight with a sword in a more effective way. Also, they could bond over their shared experiences of having to deal with a lot of responsibility at a young age. Their different powers could complement each other. For instance, demigods could use their physical strength to get into places where magic might not work, and wizards could use magic to solve problems that demigods' powers can't handle.
Well, in Percy Jackson fanfiction, Takara Phoenix could be an original character created by the fanfic writer. They might be a demigod with unique powers or a character from a different mythology incorporated into the Percy Jackson universe. Without reading the specific fanfiction, it's hard to say exactly who they are.
Yes, there are some interesting ones. You can start by looking on fanfiction platforms like Archive of Our Own. There you might find stories that blend the Percy Jackson world with the concept of a phoenix in unique ways, perhaps giving Percy or other characters phoenix - like abilities.
You can start by looking on fanfiction.net. It has a large collection of Percy Jackson fanfics, and there are likely some that involve Phoenixes. Just use the search bar and type in relevant keywords like 'Percy Jackson' and 'Phoenix' to narrow down your search.