How about a story where they team up to solve a mystery in their spooky town? There could be strange disappearances or unexplained phenomena, and they use their combined skills - Casper's ghostly abilities and Mantha's knowledge of the town - to figure out what's going on. This would be a much more positive and engaging topic for fanfiction.
You could focus on their adventures together in a new mission. Maybe they are exploring an uncharted planet and have to face various challenges like strange creatures and difficult terrains.
They could be involved in an adventure together where Aphrodite's powers of charm and Percy's combat skills combine. Maybe they have to work together to rescue a group of mortals who have been trapped by a powerful and evil magical being. This would show their different strengths coming together for a good cause.
A great topic could be their adventures together. Maybe they go on a quest to find a lost magical artifact that is important to their world. This would allow for lots of action, character growth, and exploration of their friendship.
One great topic could be their adventures together. They could be on a quest to solve a mystery within the fictional world they inhabit. This would allow for exploration of their skills, intelligence, and how they work as a team.
It's not a good idea. Fanfiction should focus on positive aspects such as character development, new storylines within the framework of the original work that are family - friendly or at least appropriate for a general audience. Sexual fanfiction often crosses the line into inappropriate territory.
You could write about their first meeting from each other's perspective. Maybe Batman is initially skeptical of Wonder Woman's powers and her more idealistic view of the world, while Wonder Woman is intrigued by Batman's more brooding and strategic nature. This kind of character - driven story would be really interesting.
You could write about their adventures together, like exploring new planets or solving mysteries in the Star Wars universe.
You could write about their daily life adventures, like how they go on a picnic together and share their dreams and stories during that time.
One could write about their adventures together. For example, how they team up to fight a powerful new villain that threatens their land. This would focus on their camaraderie and combat skills.
A great topic could be how they help the people of Arendelle during a difficult winter. They could use their skills and knowledge to find solutions to food shortages or keep the villagers warm. It would show their kindness and leadership qualities. Also, you could write about how they celebrate their wedding anniversary in a very sweet and romantic way, like having a special dinner with all their friends and family from Arendelle and the trolls.