One idea could be a story where the Dragon Commander has to face an unexpected alliance of his enemies. This would force him to use new strategies and make difficult decisions. Another could be a prequel exploring how the Dragon Commander got his start and trained his dragon.
A story could revolve around the Dragon Commander losing his memory. His friends and allies have to help him regain it while also protecting his kingdom from threats. This would add an element of mystery and character development as he discovers parts of his past.
Perhaps a fanfiction where the Dragon Commander travels to a parallel dimension. In this dimension, his enemies are the rulers and he has to find a way to overthrow them while also dealing with the differences in that world. It could involve new magic or different types of dragons.
One idea could be exploring the backstory of the dragon commanders. Maybe how they were chosen and trained before they took on their important roles. Another could be a story where a dragon commander has to form an alliance with an unexpected group to save their land from a new, powerful threat.
A really interesting plot could be that the ANBU commander discovers a long - forgotten prophecy that somehow involves the ANBU and the future of the Hidden Leaf Village. They then embark on a journey to understand the prophecy better, facing many obstacles along the way, including opposition from some within the village who fear the changes the prophecy might bring.
A plot could revolve around a character from Starcraft 2 who gets transported to the world of Supreme Commander. Let's say a Terran marine finds himself in the middle of a Supreme Commander battlefield. He has to figure out how to survive and get back home. Along the way, he teams up with some of the commanders in Supreme Commander and learns about their strategies. He then tries to adapt his own combat skills from Starcraft 2 to this new environment. This could include things like using his rifle in different ways or learning to communicate with the more robotic - like units in Supreme Commander.
One idea could be the platoon commander leading a dangerous rescue mission in enemy territory. They might have to face unexpected traps and powerful foes, but with their strategic skills and the loyalty of their team, they manage to succeed.
One interesting plot could be the dragon being reborn into a different era and having to adapt to new magical rules. For example, if it was reborn in a world where magic is scarce, it would have to find ways to regain its former power.
One idea could be a dragon rider who discovers a new type of dragon with unique abilities. For example, a dragon that can teleport short distances. This would add a whole new dynamic to the story as the rider has to figure out how to use this ability in battles or for exploration. Another plot could involve a group of dragon riders from different regions coming together to face a common threat, like a powerful dark sorcerer who wants to control all the dragons. They have to overcome their cultural differences and learn to work together.
One idea could be a young hero who has to conquer a dragon to prove their worth in a kingdom. The hero might start off as an underdog but discovers a special power or weapon along the way.
The summer dragon could be the key to saving a kingdom that is suffering from an eternal summer. A group of adventurers sets out to find the dragon and convince it to use its power to restore the normal cycle of seasons. Along their journey, they face many challenges like treacherous terrains and other dangerous magical beasts.
Well, a great plot for dragon maid fanfiction could involve the dragon maid learning about a new power she has. For example, she discovers she can communicate with other magical creatures. Or there could be a story where she tries to throw a surprise party for her master but everything goes wrong in a humorous way. Also, a plot where she teams up with other maids (maybe from different magical backgrounds) to solve a mystery in the town they live in.
One idea could be a dragon disguised as a new student in high school. It tries to fit in while hiding its true identity and dragon powers. Another could be a group of students who discover a secret dragon lair beneath their high school and have to protect it from those who would misuse the dragon's power.