Ginny Weasley only appeared in one episode ("Ginny"). Harry was in love with her, and wooed her, saying nice things to her, such as saying she was hot and like a stove. Harry also says he'd make out with her and he said she would look HOT with a pixie cut like Ron's hair but with a bow in it. Ginny never moves or talks.
At one point, Harry practices saying nice things to Ginny by letting Ron put a bow in his hair, pretending to be Ginny. But then Harry finds that Ginny has had her hair cut just like he said, and so when he returns to Ron he gets confused because they look identical and ends up Avada Kedavra-ing himself.