What could be the possible plot of the 'rwby ruby turns evil fanfic'?

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.

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.

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.

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.

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.

One possible plot could be that Ruby accidentally stumbles upon an ancient relic that causes her to grow giant. She then has to figure out how to reverse the effect while still using her new size to fight off a sudden influx of powerful Grimm. Her friends in Team RWBY would be both amazed and a bit worried as they try to help her control her newfound strength.

Well, it could be about Ruby finding a magical cookie that gives her special powers. Maybe she has to protect this cookie from some Grimm that are attracted to its magic.

Well, it could be that Ruby has been through a tough battle and is feeling down. Her grandparents show up unexpectedly and give her a big, warm hug to comfort her and let her know she's not alone.