I was always surprised by the character's development of Amy.
In the beginning she is a nice, normal girl. She becomes a witch, and uses her power with a form of moderation (okay, the thing with the test was not right, but it wasn't really bad). Like when Xander forced her to do the love spell on Cordelia, she was extremelly reluctant. In season 3, she performs her famous rat-spell and stays a rat for three years. When Willow derats her, Amy comes back as a magic-addict, hatred character. And one of the first thing she does when she's human again is go to Rack, and she apparently is one of Rack's favourite. Does that mean she already was going there when she was cute nice Amy?
Why do you think she became that dark and vengeful when she became human again?
In the beginning she is a nice, normal girl. She becomes a witch, and uses her power with a form of moderation (okay, the thing with the test was not right, but it wasn't really bad). Like when Xander forced her to do the love spell on Cordelia, she was extremelly reluctant. In season 3, she performs her famous rat-spell and stays a rat for three years. When Willow derats her, Amy comes back as a magic-addict, hatred character. And one of the first thing she does when she's human again is go to Rack, and she apparently is one of Rack's favourite. Does that mean she already was going there when she was cute nice Amy?
Why do you think she became that dark and vengeful when she became human again?