The future of fanfiction is uncertain. It could see more crossover between different fandoms, or perhaps a focus on more niche and unconventional themes. Who knows? It's all up to the imagination of the fanfic community.
Well, in Percy Jackson god future fanfiction, the characters could face all sorts of new challenges. Maybe the gods will demand more from Percy and his friends. They might have to deal with new monsters that are even more powerful. It could also be that the relationships between the characters change. For example, Percy and Annabeth might have to make some tough decisions regarding their future together, like whether to stay in the demigod world or try to live a normal life. There could be new alliances formed among the demigods too, to face whatever the future throws at them.
Well, it's hard to predict exactly, but perhaps you'll experience love in many forms. There could be deep friendships that last a lifetime and a romantic relationship that brings you great joy. You might also face some challenges along the way, like health issues or financial difficulties, but these will only make you stronger in the end.
In their married fanfiction future, they might travel the magical universe together. Discovering new spells and magical creatures. They could also become mentors to young students at Alfea, sharing their combined knowledge of magic and combat.
In some fanfictions, Mal and Ben could start a family. They would be great parents, teaching their children about the importance of unity between the villain and hero kids. They might also take on projects to improve the lives of the less - privileged in Auradon. For example, building more schools in the poorer areas. Their love would be an example for all the young people in Auradon.
They could have a family. Imagine little dragon slayers or celestial wizards running around. Their children would inherit their strong magical powers and grow up in a loving family environment.
One possibility is that they would face many challenges together. Since they are from different worlds in a sense, they'd have to deal with the politics of the devil world. Their relationship might be a symbol of change, leading to more cooperation between devils and humans. Also, their engagement could bring about a new era of peace in the 'Highschool DxD' universe.