Well, you could write a fanfiction where Hercules loses his strength for a while. He then has to rely on his friends and his own inner courage more than ever. This could lead to some great character development for him. Or perhaps a story about Hercules mentoring a young hero, passing on his wisdom and skills. It would be interesting to explore how he teaches and what kind of relationship they develop.
In a 'hercules the legendary journeys fanfiction', a really cool plot could be that Hercules discovers a long - lost relative who has been trapped in a magical prison for centuries. He has to figure out how to break the spell and free this relative. Along the way, he uncovers secrets about his family's past that change his perspective on his own powers and destiny. This would involve a lot of research into the existing lore of the Hercules universe and also some creative twists on the known storylines.
Definitely include Iolaus. He's Hercules' loyal friend and sidekick. His skills in combat and his ability to get Hercules out of trouble are always interesting to write about. Also, Aphrodite could be a great addition. Her powers of love and beauty can add a different dynamic to the story, whether she's helping or causing trouble for Hercules.
One idea could be that Percy and Hercules have to team up to defeat a new powerful monster that is a combination of Greek and Roman mythological beasts. They would have to combine their unique skills, like Percy's water - based powers and Hercules' superhuman strength.
One idea could be that Hercules falls in love with a mortal who is a healer. She helps him when he's injured during one of his quests, and their love blossoms as he discovers her kind heart and selfless nature.
One idea could be that Aladdin, while on one of his adventures in the marketplace, stumbles upon a magical item that transports him to Hercules' world. There, he meets Hercules and they team up to defeat a common enemy, like a powerful sorcerer who is causing chaos in both their realms.
One idea could be exploring how Hercules' strength is affected during the pregnancy. Maybe he has to learn to control his power more carefully so as not to harm himself or the unborn child. Another could be about the reactions of his friends and family. They might be surprised, worried, or overly protective.
One idea could be a story where Naruto discovers a hidden samurai clan and has to learn their ways to defeat a new powerful enemy. Maybe he has to master their unique sword techniques.
Another plot could revolve around the relationships between the existing legendary summons. Maybe there's a power struggle among them, and Naruto has to step in and mediate. He could learn about their ancient rivalries and use his skills to bring them together to face a common foe like a powerful, ancient evil that has been awakened.
One idea could be a story where Naruto discovers a hidden ancient jutsu that changes the power balance in the ninja world. He has to learn to master it without being corrupted by its power.
A really engaging plot could be that a powerful sorcerer puts a spell on Meg that makes her age rapidly. Hercules is desperate to find a cure. He travels the world, seeking the advice of wise old sages and facing numerous mythical beasts. Along the way, he discovers more about Meg's past and how her experiences have shaped her. Another plot idea is that Hercules and Meg stumble upon a hidden village where they are worshiped as gods. However, they soon realize that the village is being oppressed by a false god, and they must use their combined strength and wits to free the villagers.
One idea could be creating an OC who is a demigod from a different part of the world in the Hercules universe. Maybe they have unique powers related to their cultural background. For example, if they're from a land inspired by the Arctic, they could have ice - based powers. Another idea is an OC who is a childhood friend of Hercules but was lost during one of Hades' schemes and now returns as a changed person, with a mix of bitterness and the original good heart. They could either be a helper or a foe depending on how they deal with their past.