A cool idea might be a fanfic where the shield can transform. It could start as a small, unassuming object but then grow and change shape depending on the situation and the amount of chakra it absorbs.
One idea could be to focus on a new trainer's journey in the Galar region. They could start with a unique Pokemon not often chosen, like a Galarian Zigzagoon, and face various challenges that the game doesn't cover. Another could be a story about the backstory of a Gym Leader, perhaps their rise to power and the secrets they hold. Maybe a fanfic where Pokemon from different regions end up in Galar and how they interact with the local Pokemon and trainers.
Well, you could write a fanfic where the Shield Hero gets transported to a different part of the world that has a completely different culture and set of rules. This would force him to adapt in new ways. You could also do a story where he teams up with an unexpected ally, someone who was initially his enemy. Maybe a character from the antagonist side realizes that they have a common goal and decides to join forces with the Shield Hero. And don't forget about a time - travel fanfic, where the Shield Hero goes back in time to change certain events that happened to him at the start.
One idea could be a fanfic where Miles has a secret power that he discovers while on a mission with the Agents of Shield. This power could be something that changes the dynamic of the team and how they operate.
You could write a fanfic where the Shield Hero has to deal with a curse that not only affects his physical abilities but also his mental state. This curse could be placed on him by an unknown enemy. The fanfic could then follow his struggle to break the curse while still fulfilling his duties as the Shield Hero. He might have to seek help from unlikely sources, like a group of outcasts who have knowledge of ancient magic.
One idea could be exploring an alternate timeline where the Shield Hero starts with different abilities. For example, instead of just the basic shield, he has a shield with hidden offensive powers.
One idea could be a story where a new villain emerges who has the ability to manipulate time. The Agents of Shield and the Avengers have to work together to stop this villain before he changes history in a way that destroys the world. Another plot could involve an agent from Shield who discovers a long - lost relative who has superpowers and is being hunted by an evil organization. The agent has to protect their relative while also dealing with the implications of this newfound family member within the context of their work with Shield and the Avengers.
One idea could be a time - travel fanfic where Naruto or Sasuke go back in time and try to change certain events. This would allow for a lot of creative storytelling as they interact with their younger selves and try to prevent future tragedies.
One idea could be to create an alternate universe where Naruto has a different elemental affinity from the start. For example, instead of wind, he has lightning. Another could be a fanfic focused on the relationships between the characters outside of the main plot, like how Sakura and Ino rekindle their friendship in a more in - depth way. Or you could write about Naruto's training journey with a different mentor, say Jiraiya's long - lost brother who has a completely different teaching style.
One idea could be a fanfic where Naruto travels to a different dimension where the Akatsuki are the heroes. Another could be a story about Naruto's kids growing up in a world where there's a new threat that they have to face without their parents' immediate help. And a third idea is a fanfic where Naruto discovers a hidden bloodline within himself that gives him unique powers.
A crossover with 'Overlord' could be really exciting. The Shield Hero could come across the powerful beings from Nazarick. There could be a conflict at first due to misunderstandings, but then they realize they can work together. The Shield Hero could use his strategic skills along with the power of the Overlord's minions to face a common enemy that is a threat to both their existences.