Rizzo is the tough talking bad girl in the musical Grease, played by Stockard Channing. She is one of the Pink Ladies.
Rizzo has a bad reputation in school as a slut. Her song There are Worse Things I Could Do makes her feelings clear - she is bored and wants adventure, she acts tough, but is sensitive and romantic, and she sees the good girls as hypocrites.
When she thinks she is pregnant, she is cold to her boyfriend Kenickie, not wanting to seem vulnerable or needy. She also seems to fear that he may want to marry her out of a sense of obligation.