Power is a common theme. Thanos is extremely powerful and Wanda has her chaos magic. Fanfictions often explore how their powers interact or clash. For example, in some stories, Thanos may try to control Wanda's power for his own ends.
The theme of the outsider also appears. Both Thanos and Wanda can be seen as outsiders in different ways. Thanos is an outcast in the universe due to his extreme beliefs, and Wanda has always been different from the other Avengers. Fanfictions may explore how they find common ground as outsiders.
Another theme is the idea of redemption. Thanos has done many terrible things, and in some fanfictions, Wanda might be the one to make him see the error of his ways. It's about whether he can be redeemed through his relationship with her.
One common theme is friendship turning into something more. They often start as comrades and then feelings start to develop.
One common theme is the exploration of their powers. Since both have extraordinary abilities, fanfictions often focus on how these powers interact or could be combined. For example, Wanda's magic and Peter's spider - sense could potentially create some really cool scenarios.
A common theme is the exploration of power. Percy has his demigod powers and Wanda has her magic. Fanfictions often show how they combine or contrast their powers. For example, in some stories, they might use their powers together to defeat a powerful foe.
Another theme is the discovery of each other. Many fanfictions focus on how they get to know one another on a deeper level. They might start from a misunderstanding or just being strangers, but as the story progresses, they learn about each other's pasts, fears, and dreams, which strengthens their relationship.
One common theme is the power dynamic. Tony is a tech - genius and Wanda has her reality - warping powers. Fanfictions often explore how they balance and complement each other's powers.
Redemption is another theme. Some fanfictions explore the idea of Thanos being redeemed through his relationship with the reader. The reader might see something good in him that others don't, and try to bring out that side. This can lead to some very interesting character development arcs.
A common theme is the clash of ideologies. Thanos with his view of 'balancing the universe' and Tony, the defender of Earth. Their different beliefs often lead to intense confrontations and debates within the fanfictions.
Redemption can also be a theme. Maybe the OC tries to bring out a different side of Thanos, a more humane or less tyrannical side. This often involves a complex relationship development between the two characters in the fanfiction.
Power is a common theme. Both Thanos and Loki are power - hungry in their own ways. In fanfictions, they often either compete for power or try to use each other's power for their own goals. Another theme is redemption. Sometimes Loki is seen as a way for Thanos to find redemption, or vice versa.
One common theme is mentorship. Since Peter is younger, Wanda could be seen as a mentor figure, guiding him in controlling his powers better. Another is friendship, showing how they support each other through tough times in the Avengers.