Muffy And Francine, Arthur
This was probably your introduction to frienemy territory as a kid. Muffy was the rich princess that came in a limo to school every day, and Francine was the tomboy who lived in an apartment with her blue collar family. These differences often times made the girls clash just as often as they liked each other, creating small rivalries, big spats, and a lot of teachable moments on what it means to apologize.