The Sin of Free Will

This is my protagonist in my thesis story. She is the 4th humanoid. The theme is Free will. She can chose either something good or evil. End of the story, she changes her form based on her choice. (Killing point is the rusty sword on the shield)

[story]_ A black magician creates 4th humanoid, Free will. but she doesn't obey the black magician. Because of that she is destroyed and abandoned right on the spot. After that she is found by a mysterious boy, 'Hope'. He takes care of her. He also gives her very old shield and talisman that keeps her evilness inside. The boy asks Free will to be a savior. She could be a savior or destroyer. Everything depends on her choice.

I believe humans have free will, and hope people try to chose something good. Philosophically and scientifically, free will it self must be very fascinating theme.