3. Lisa Bonet
Most Memorable Role: Denise Huxtable on The Cosby Show
As free-spirited Denise Huxtable on The Cosby Show in the '80s, Lisa Bonet represented your best friend's older sister who you had a thing for, but who everyone knew was too cool for you, what with her artsy nature and Bohemian style. Yet, we got to know Denise throughout the course of the show, falling for Bonet in the process.