3. Peggy Olson
Showcase Episode: "The Suitcase"
"I am one of those girls," Peggy told her big sister when she first decided to move to Manhattan. And look at her now: strutting down the hallway, with shades, cigarette and Thermos in place. Always easily overlooked by people around her, Peggy had a tough time getting taken seriously at first — especially by her usual underminer Joan, who never met a Peggy triumph she couldn't smother in side-eye. ("I'm glad your other work was suffering for a reason." Nice one.) But Peggy will always be the new girl, because she keeps moving forward (sometimes on roller skates), the way her once and future mentor Don taught her. And her weird bond with Don has sustained them both through all their Burger Chef ups and Pizza House downs.