Their relationship could start with mutual self - interest. They both recognize the power and chaos the other can bring. For example, Toga's ability to transform could help Villain Deku infiltrate places, and he can offer her protection in return.
Maybe Villain Deku and Toga team up to take down a common enemy that has wronged them both in the past. As they work together, a strange and dark relationship forms between them. Toga starts to develop deeper feelings for Deku, but he's only focused on revenge at first. However, over time, his view of her might change.
One popular 'villain deku x toga fanfic' might be 'Dark Alliances' which delves into their unique relationship in a world where Deku has turned villainous. It shows how their bond forms in the face of a chaotic society.
His friends could come to the rescue. Bakugo, for instance, might use his explosive power to break into Toga's hideout. He's always been competitive with Deku, but he also cares about him deeply.
The relationship could start with hatred. Bakugou may initially be enraged that Deku has become a villain. But as time passes, he starts to see the reasons behind Deku's transformation, which could lead to a more complex relationship.
For Deku, his character can be developed by showing his struggle to understand Toga's family's situation. He has to balance his hero values with the new perspective he gets from being involved with them. For Toga, her character can grow as she learns to trust Deku more in the context of her family. Her family members can be developed by giving them unique personalities and backstories. For example, one family member could be a former hero who retired due to an injury, and this could add depth to the story.
One key element is the exploration of their dark sides. Since Deku is a villain here, his usually heroic traits are twisted. And Toga's already unstable nature gets even more interesting when paired with him. There's often a lot of morally grey areas explored.
They have a complex and adversarial relationship. Toga has an interest in Deku, but Deku is constantly on guard against her as she's a villain.
Well, one possibility is that Toga kidnaps Deku to get closer to the heroes. Maybe she thinks she can use Deku as a bargaining chip to make the heroes do something for her. For example, she might demand the release of some of her villain friends from prison.
One interesting Deku and Toga fanfiction could be about them forming an unexpected alliance. Maybe in a world where the hero - villain divide is not so clear - cut, they team up to face a greater threat that endangers both heroes and villains alike.
It usually involves interactions and conflicts between Toga and Deku, with elements of action and drama.