Goody Two Shoes

Joanna McGonagall was in short, a goody two shoes. She didn't try to be, but with a grandmother like Professor McGonagall she knew she had big shoes to fill. That and her desire to become one of the best healers in all of Britain kept her fairly busy. After the death of her mother and with her father's condition, Joanna could only dream of a day when she would be able to help those who truly needed it. This in all, left hardly anytime for silly things like pranks.

George Weasley was the definition of a troublemaker. With the assistance of his twin brother Fred the two wreaked havoc on all of Hogwarts. While confident towards everyone else, Joanna made him into a stuttering fool.

Joanna's goal was to score only O's on her o.w.l.s.
George's was not to look like an idiot in front of Joanna.
Fred's was to finally get his brother and the goody two shoes together so he could stop watching him make a fool of himself.