Well, perhaps the dragon is born during a time of great turmoil in Hyrule. It could be prophesied to either save or destroy the kingdom. As it grows, it forms alliances with different characters, like Link or Zelda. It has to learn about its powers and how to use them for the good of Hyrule, all while facing the forces that oppose it.
One idea could be the dragon having to hide its true identity in Hyrule. Maybe it discovers a long - lost power within the land that only it can unlock.
A possible plot could be that the dragon, being born in Hyrule, has a connection to an ancient magic that is fading. It embarks on a journey to find the source of this magic and restore it. Along the way, it encounters various challenges such as dangerous monsters, treacherous terrains, and mysterious ruins. It also has to deal with the mistrust of the Hylian people who fear its power at first but later come to realize that it is their only hope against an even greater evil that is threatening Hyrule.
One idea could be an OC who is a long - lost relative of a main character. They show up in the middle of the battle with unique powers. For example, if related to Link, they might have a different form of the Triforce power.
One idea could be a crossover where Naruto characters end up in the Hyrule Warriors world and have to learn to fight with the unique weapons and magic there. For example, Naruto could try to use his shadow clones with the Hylian sword techniques.
A plot idea might involve the Links having to deal with a rift in the fabric of Hyrule that is causing strange crossovers between different regions and time periods. They would have to find a way to close the rift while also navigating the chaos of these new, merged landscapes.
One idea could be a crossover with the Legend of Zelda: Breath of the Wild. The characters from Hyrule Warriors could interact with the new characters and the open - world setting of Breath of the Wild. For example, Link from Hyrule Warriors could team up with Zelda from Breath of the Wild to fight against a new common enemy that threatens both their worlds. Another idea is a crossover with other Nintendo franchises like Super Mario. Picture Mario and Luigi joining the battle in Hyrule, using their unique abilities alongside the Hyrule Warriors characters. Maybe they could help in a big siege against Ganon's forces.
Link could be a main character. He might befriend the dragon or initially be suspicious of it.
One idea could be that as a girl, Ichigo discovers new friendships in a different way. Maybe she forms a closer bond with female characters who previously saw her as a rival when she was male. Another could be that she has to deal with different expectations in the Soul Society as a female Shinigami, like different training regimens or social norms.
One idea could be that as a girl, Sasuke might face different challenges in the ninja world regarding gender expectations. For example, she could be underestimated at first but then prove herself to be just as strong as in the original story. Another plot could involve her having different relationships with the male characters, like a more sisterly bond with Naruto perhaps.
Maybe Percy has to deal with other gods being jealous or threatened by his sudden ascension to godhood. He could face challenges from them to prove he's worthy of being a god. This would involve epic battles and political intrigue in the world of the gods.
One idea could be a character who discovers they have a unique ability to communicate with dragons on a deeper level, which helps in the breeding process. For example, they can understand the dragons' mating preferences and use that knowledge to breed rare and powerful dragon species.
One idea could be that Percy struggles to control his new vampire instincts while also trying to hide his identity from his friends. Another could be that he discovers a hidden vampire society within his town and has to navigate their politics.