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 possibility is that they find a future where Voldemort won the battle in their original time. This would be a dark and desolate world. They would then have to figure out a way to change the past to prevent this future from happening. They could also find that in this future, the Hogwarts they knew is in ruins and they have to gather allies to rebuild it and restore the magic in the world.
Their relationship might become more trusting. In the future, they could have overcome their past differences and rivalries completely. They might rely on each other more for support and decision - making, becoming true friends or even something more.
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.
In a future fanfiction where Draco and Hermione have a child, the story could explore the challenges of their child growing up in a wizarding world still divided by old prejudices. The child might struggle with being a product of two former rival houses. It could also show how Draco and Hermione's relationship evolved over time, from enemies to lovers, and how they are now co - parenting. Maybe the child discovers a new form of magic that could bridge the gap between Slytherin and Gryffindor once and for all.
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.
He could be very intelligent like Hermione. He might have a sharp mind for magic and academics. Also, he could inherit Draco's sense of pride and self - assurance. Maybe he's a bit of a loner at first because he feels different from the people of the past, but as he gets more involved in the story, he becomes more sociable.
There could be a secret passageway in the school that leads to an ancient mythological place. Percy and Annabeth discover it by accident. Percy is excited to explore but Annabeth warns him to be cautious. They enter together, facing various traps and puzzles inside. Along the way, they might meet some minor gods or spirits who are either helpful or try to hinder their progress. This adventure would test their skills and teamwork, just like their quests in the original stories.
They might have all kinds of adventures. Ichigo could use his Soul Reaper powers in the magical world of Hogwarts. Maybe he'd face off against dark wizards with his zanpakuto. Dark Ichigo, being more chaotic, might get into trouble with the Hogwarts rules and end up in a duel with some of the more hot - headed students.
In one fanfic, they go on an adventure to find a rare magical plant that is said to have healing properties for magical creatures. They face many obstacles like dangerous terrains and other dark creatures, but their combined knowledge and Hagrid's strength help them through.
One adventure could be related to a mysterious magical artifact hidden somewhere in Hogwarts. They hear rumors about it and decide to search for it together. Along the way, they face challenges like magical traps set by previous Hogwarts students or even some dark magic that guards the artifact. But because they are twins, they have an unspoken understanding and are able to use their combined skills - Harry's bravery and Draco's cunning - to overcome these obstacles.
They could have all sorts of adventures. Maybe they'd get sorted into different houses and have to deal with the rivalries that come with that. Percy might use his water - controlling abilities in the Hogwarts' lake, and Thalia could use her lightning powers during a stormy Quidditch match. Nico could explore the Hogwarts' underground secrets, using his underworld - related skills to uncover hidden chambers.