Perhaps they go back to a time when Hogwarts was just being built. They could help in the construction in some magical ways. Hermione would know all about the architecture and magical building techniques from her studies. Luna might find some lost magic in the grounds that was long forgotten. Ginny could make friends with the first students of Hogwarts and influence the development of Quidditch at the school.
One possible adventure is that they go back to a time when a powerful dark wizard was rising to power. They could use their combined intelligence and magic to stop him. Hermione would come up with clever plans, Luna would provide her unique insights and Ginny would be the brave one to execute dangerous tasks. They might also encounter young versions of their own relatives or teachers, which would be a very strange and interesting experience.
Their presence could change history in many ways. If they introduced modern spells or magical concepts, it could accelerate the development of magic. For example, Hermione's knowledge of advanced spells could be passed on. Ginny's boldness might inspire students of that time to be more courageous. Luna's open - mindedness could change the way people think about magic and the unknown. They might also accidentally change the course of important events, like the outcome of a wizarding duel or the selection of a Hogwarts headmaster.
Well, they could stumble upon a world where the wizarding and Muggle worlds have merged in unexpected ways. Maybe there are flying cars everywhere that are powered by a combination of magic and Muggle technology. And they could get involved in a battle to preserve the balance between the two worlds, as there might be some who oppose this new form of coexistence. Also, they might discover new magical creatures that have evolved in the future.
One great Hermione, Ginny, and Luna time travel fanfiction is 'Time's Whimsy'. In this fic, the three girls are sent back in time and have to navigate the wizarding world of the past. They use their combined knowledge and unique skills to deal with various challenges. For example, Hermione's vast book knowledge, Ginny's courage in the face of danger, and Luna's out - of - the - box thinking all play important roles.
Another common theme is female empowerment. In many fanfictions, Luna, Ginny and Hermione are shown as strong, independent witches who can take on challenges on their own. They might team up to fight against some sort of male - dominated magic system or idea in Hogwarts. It's really inspiring to see their strength.
They might have adventures like exploring hidden parts of Hogwarts that they never knew before. Maybe they find a secret room filled with ancient magic spells.
They might have an adventure where they stumble upon a hidden magical grove. In this grove, there are plants with unique magical properties that they've never seen before. They could spend time studying these plants and perhaps even discover a new potion ingredient.
They could go on adventures to uncover their family's past. Maybe there are some hidden magical artifacts or secrets related to their family that they need to find. They might also embark on a journey to protect their family from a new dark threat that specifically targets their family line.
They might go back in time and accidentally change something that has a huge ripple effect on the future. So then they have to scramble to fix it before they return to their own time. They could also go back in time to learn some long - lost magic from an ancient wizard or witch and bring that knowledge back to their time to defeat a new dark force.
They could go on adventures to discover lost magical artifacts. For instance, they might search for an ancient wand rumored to have extraordinary powers. Along the way, they would face various obstacles like traps set by long - dead wizards and magical creatures guarding the artifact.
Romance can also be a theme, not in the traditional sense of just one - on - one relationships. Sometimes it's about the complex relationships between the three of them. For example, some fanfictions might explore a polyamorous relationship. And then there's the theme of female empowerment. They are all strong female characters, and fanfictions can show them taking on challenges and breaking gender norms in the wizarding world. There are also stories that focus on their academic and magical achievements, highlighting their intelligence and skills.