Another interesting plot twist could be that Wonder Woman loses her powers temporarily. In this state, Superman has to protect her while also trying to figure out how to get her powers back. This would reverse their typical roles and add an unexpected dynamic to their relationship in the fanfiction.
Another plot twist might be that an alien force manipulates their DNA, causing them to swap powers temporarily. So Supergirl has Superman's classic powers like super - breath and Superman has to adjust to Supergirl's more heat - based vision and flight style. This would force them to rely on each other in new ways and learn from one another's experiences.
In a 'Wonder Woman meets Superman' fanfiction, they might team up to fight a powerful common enemy. For example, a super - villain from another dimension could threaten Earth, and their combined strength and different abilities would be needed to save the day.
One idea could be that Superman and Wonder Woman have to team up to stop an ancient alien threat that is immune to their individual powers. They must combine their strength, speed, and wisdom to find a way to defeat it.
A good plot could be that the world is suddenly hit by a wave of anti - superhero sentiment. Wonder Woman and Superman are two of the main targets. They have to go undercover and live among the humans for a while. During this time, they learn more about the regular people's fears and concerns. They also start to develop a romantic relationship as they rely on each other for support in this difficult situation.
Maybe in the fanfiction, Superman and Wonder Woman get married in a secret ceremony. Then they have to deal with the reactions of their superhero friends and the public. Some are happy, while others are worried about the implications of their union on the superhero community.
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.
In a fanfiction, it would be cool if Supergirl and Wonder Woman met during a time - traveling adventure. They could end up in different historical periods and have to work together to fix the timeline. For example, they might find themselves in the middle of a war in the past where a powerful weapon is about to be used that could change the future. Their combined powers of super - strength, flight, and Wonder Woman's combat skills and Supergirl's heat vision would be essential to stop the disaster. This kind of plot would allow for a lot of exploration of different time periods and cultures as well as their relationship.
A great storyline is when a powerful ancient artifact is discovered. This artifact has the potential to destroy the world if misused. Superman and Wonder Woman are both drawn to protect it. However, they face many challenges as various villains also want to get their hands on it. Along the way, they learn more about each other's pasts and how their powers originated, which deepens their friendship and partnership.
In a 'Thor meets Wonder Woman' fanfiction, perhaps they meet in a neutral realm. Thor is intrigued by Wonder Woman's connection to the Greek gods while she is curious about his Asgardian heritage. They get involved in a tournament of sorts where they have to team up against other powerful beings. During this time, they share stories of their heroic deeds. Thor tells her about his battles against the Frost Giants and Wonder Woman shares her tales of protecting the world from Ares. By the end of the tournament, they exchange gifts - Thor gives her a small Asgardian charm and she gives him a piece of Amazonian armor.
One interesting scenario could be that they kiss during a battle to gain a sudden burst of power. Their combined strength and the emotional energy from the kiss helps them defeat a powerful enemy that neither could have faced alone.