Nnenna stated that she was raised in Nigeria but later sent back to the US due to her father wanting a better life. Her mother died while giving birth to her last sister.
On the show
Agba's head was shaved during the model makeover after the judges expressed their approval of her look when they simulated baldness in a previous photoshoot. Though considered a front-runner early on, she was eliminated in episode nine. During the season, Nnenna had a major fight and arguement with her boyfriend, which was mostly due to episode four photoshoot with male models, whom she kissed while posing, creating major misunderstanding.
Since Top Model, Nnenna has signed with MC2, formerly known as Karin Models. She has graced the cover of Onyx Style Magazine. During the Spring 2007 New York Fashion Week, Nnenna has walked for Anand Jon Spring/Summer 2007 and Imitation of Christ Spring/Summer 2007. Nnenna Agba modelled at the 9th Annual Chocolate Fashion Show which took place in NYC. She appeared in an all-chocolate couture dress by celebrity favourites, Traver Rains and Richie Rich of Heatherette.