They have reverse characters. On the outside, Darcy is cold and alienating, while Wickham is charming and friendly. On the inside, Darcy is capable of great acts of kindness and love, while Wickham is a sleazy fortune-hunter. This is further supported by Elizabeth's relations to the two. Wickham is initially her ideal man, and she views Darcy as no better than Darth Vader. After she learns their true natures, however, she reverses her opinion. It seems as though Wickham and Darcy are meant to play each other's opposite.