One possible plot in the 'chichi turns evil fanfic' could be related to a broken heart. Let's say she falls in love with someone who doesn't love her back or betrays her. This emotional trauma could be so great that it twists her personality. She then decides to take revenge on the world that she feels has wronged her. She might start by targeting the people or things associated with her lost love and gradually expand her malevolence to others.
Well, it could be that Chichi is betrayed by her friends and that turns her evil. Maybe she discovers some dark secrets about her past that make her lose faith in good. Or perhaps she is influenced by an evil force that corrupts her pure heart.
In the 'chichi turns evil fanfic', perhaps she gets tired of always being the good one. She might start to think that being evil gives her more power and freedom. So she begins to make bad choices like using her powers for selfish reasons or hurting those who once she protected. For example, if she has some special abilities, she could use them to cause chaos instead of maintaining peace.
One possible plot could be Ruby being betrayed by her closest friends. Maybe she discovers a dark secret about the Huntsman academies that makes her question everything she has ever believed in. This disillusionment could start her on the path to evil as she feels that the system she has dedicated her life to is corrupt.
There could be her friends or family members. If it's about her turning evil due to a betrayal, those who betrayed her would be important characters. Maybe it's a close friend who she trusted completely but was secretly jealous of her.
Well, perhaps Asta could be corrupted by a powerful dark magic artifact. He might start to see his friends as obstacles in his quest for power and turn against them.
One plot could be that Gohan decides to help Chichi with her garden. They start by planning what to plant. As they work together, they accidentally get some mud on their faces and start laughing. They plant all kinds of vegetables and flowers. In the middle of it, Gohan remembers some stories his father told him about gardening. He shares these with Chichi, and she listens intently. By the end of the day, they look at the newly planted garden with pride and a sense of accomplishment, and their bond grows stronger.
One possible plot could be Pikachu getting influenced by a dark and powerful Pokemon. For example, a Darkrai might use its nightmare - inducing powers on Pikachu. This could make Pikachu start to attack other Pokemon and trainers without mercy. Maybe Pikachu would first target its own trainer, Ash, as it would be the most shocking turn of events. This would create a lot of chaos in the Pokemon world and force Ash and his other Pokemon friends to try and figure out how to save Pikachu from this evil state.
One possibility could be that they turn evil due to a powerful enemy using some dark magic or jutsu on them. This could make them lose their sense of self and start causing chaos in the Hidden Leaf. For example, they might start attacking their former friends and allies, believing they are now enemies.
There are probably 'naruto is evil' fanfics out there. A possible plot could be that Naruto is influenced by some dark force. This force twists his perception of right and wrong. As a result, he starts to target his former friends and allies. He might use his skills to cause chaos in the ninja world, believing that the current system is corrupt and needs to be overthrown.
One possible plot could be that Bumblebee gets corrupted by some dark force. Maybe he's exposed to a powerful alien artifact that twists his mind and makes him turn against the Autobots. He could start causing chaos, attacking his former allies and teaming up with the Decepticons.
Another plot could be that he is exposed to some sort of mind - controlling substance or technology. The enemy could be using it to turn him against Gotham. Under this influence, he starts to see his friends as foes. He could begin to attack the Bat - family and other superhero allies. His actions would be erratic and violent, and the city would be in chaos as they try to figure out what happened to their hero and how to stop him.
One possible plotline could be that Naruto is constantly shunned and mistreated by the village despite his efforts to protect it. This continuous rejection could gradually turn his heart cold and make him seek revenge. He might start using his powerful jutsu against those who once wronged him, like attacking the Hidden Leaf's leadership.