Who are Cherry and Marcia?

Cherry Valance

Cherry is a redhead Soc girl, Bob's girlfriend, whom Ponyboy meets at the drive-in when Dally is bothering her and Marcia. In their first one-on-one interaction, Ponyboy realizes how much principle means to Cherry: "Cherry had said she wouldn't drink Dally's Coke if she was starving, and she meant it. It was the principle of the thing. But Marcia saw no reason to throw away a perfectly good, free Coke."

Marcia

Cherry Valance's friend, whom Ponyboy and Johnny meet at the drive-in theater. She is "a little smaller than Cherry" and "cute," with "short dark hair."