Perhaps in the 'rwby ruby turns evil fanfic', Ruby is influenced by a powerful and malevolent force. It could be an ancient evil that latches onto her in a moment of weakness. For example, during a particularly difficult battle where she is severely injured and feels helpless, this evil force offers her power in exchange for her soul, slowly turning her evil as she accepts more and more of its dark gifts.
In this fanfic, Ruby might turn evil due to a misunderstanding. She could be framed for a crime she didn't commit against Vale. As she tries to prove her innocence, the people she once protected turn against her. This constant persecution and the feeling of being alone against the world could warp her mind, leading her to think that if the world sees her as a villain, she might as well become one.
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.
Well, one possibility is that Ruby could be influenced by a powerful and evil relic. Maybe she discovers a dark side of the relic's power and becomes corrupted by it, gradually turning evil as she starts to value power over her friends and the greater good.
The main antagonist could also be a new character created specifically for the fanfic. This character could be an ancient evil that has been waiting for an opportunity to corrupt a powerful Huntress like Ruby. They would then use Ruby's newfound evil nature to further their own dark plans, and Weiss, Blake, and Yang would have to face both Ruby and this new threat.
If Ruby turns evil, she could become her own antagonist in a way. Her former self, the Ruby that was good, could be seen as what she is now fighting against. Her friends would also become antagonists as they try to stop her from causing more harm.
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.
Well, it could involve Ruby being influenced by an evil force in this fanfic. Maybe she's taught dark magic or has her moral compass twisted. For example, she might start seeing the world in a more cynical way and use her powers for less noble purposes.
One possible plot could be that Ruby is facing an overwhelmingly powerful enemy alone. Despite her best efforts, she is mortally wounded in the battle and dies heroically. Another could be that she sacrifices herself to save her friends from a deadly trap or a powerful Grimm attack.
Well, it could be about Ruby discovering her Saiyan powers. Maybe she starts to show super strength and speed like a Saiyan. She could use her scythe in new and powerful ways, inspired by Saiyan combat styles.
A possible plot development is that Ruby's amnesia could be a result of some dark magic or a new type of Grimm attack. As she tries to recover her memories, she discovers new powers within herself that she didn't know existed before. This new power could be related to her amnesia in some way, like it was locked away and the amnesia event somehow unlocked it. Meanwhile, her friends are on a quest to find a way to reverse her amnesia, which leads them to encounter new allies and enemies along the way.
Another theme could be about isolation. Ruby might feel alone in her problems, and self - harm could be a way for her to cope. In the RWBY universe, she has her friends, but the fanfic could be delving into how she might feel that they don't truly understand what she's going through, leading her to this self - destructive behavior.
Maybe Reese is a new student at Beacon Academy, and Ruby is assigned to be her guide. Ruby shows Reese around the school, introduces her to their friends, and they start training together. Along the way, they discover that they have some shared interests in combat techniques and a love for adventure. As time passes, they become close friends and perhaps something more as they face various threats to the school and their world.