One great Superman, Wonder Woman and Batman fanfiction is 'The Trinity Alliance'. It shows them working together against a powerful new villain. The story does a great job of portraying their unique powers and personalities. It has some really cool action scenes where Superman's strength, Wonder Woman's combat skills and Batman's strategic mind all come into play.
One popular theme is the love triangle between Superman, Wonder Woman and Batman. Writers often explore the complex relationships that could develop among them. Another theme is them teaming up against a powerful enemy that none of them could defeat alone. This shows their combined strength and the importance of their alliance in the DC universe.
Another way is through personal challenges. Let's say Batman faces a personal crisis that only Superman and Wonder Woman can help him with. This could lead to a deeper emotional connection. Superman might open up more about his alien heritage and the loneliness he sometimes feels, and Wonder Woman could share her experiences from Themyscira. As they support each other, their relationships grow.
One common theme is the team - up. Writers often explore how Batman, Superman, and Wonder Woman work together to face a powerful enemy. It could be a new super - villain or an old foe with a new twist.
Perhaps a story where they all have to deal with a new villain who has the ability to nullify their powers temporarily. They are forced to work together in a more covert way. Batman uses his gadgets, Superman his knowledge of science (since he can't use his strength), and Wonder Woman her wisdom and leadership to outwit the villain.
The idea of love triangles or complex romantic relationships within the Trinity is also a theme. Some fanfictions explore the possibility of romantic feelings between Batman and Wonder Woman, or Superman and Wonder Woman, and how that would affect their dynamic as a team and their individual characters.
One popular theme is the team - up. Writers like to explore how Superman, Batman and Wonder Woman work together to fight a common enemy. It shows their different powers and personalities interacting.
One plot idea could be a team - up where they face a new, extremely powerful villain that neither of them can defeat alone. This villain could have powers that are a combination of their weaknesses, like a being that can manipulate kryptonite and also has the strategic mind of Batman's enemies. They would have to learn to work together in a new way.