Marissa Cooper

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Marissa Cooper
The O.C. character
First appearance	"Premiere" (episode 1.01)
Last appearance	"The Graduates" (episode 3.25)
Created by	Josh Schwartz
Portrayed by	Mischa Barton
In-universe information
Nickname	Coop (by Summer) Mariss (by mother) Kiddo (by father)
Occupation	High school student (at the Harbor School; graduated)
Family	James "Jimmy" Cooper (father) Julie Cooper (mother) Caleb Nichol (stepfather; deceased) Kaitlin Cooper (younger sister) Cooper Atwood (maternal half-brother)
Significant other	Luke Ward (ex-boyfriend) Ryan Atwood (ex-boyfriend) D.J. (ex-boyfriend) Alex Kelly (ex-girlfriend) Kevin Volchok (ex-boyfriend)
Relatives	Cindy (maternal aunt)
Residence	Newport Beach, California

Marissa Cooper is a fictional character on the FOX television series The O.C., portrayed by Mischa Barton. Marissa was among the original "core four" characters on The O.C. She is a privileged California native born into a wealthy family, residing next to the Cohen family's house. Throughout The O.C.'s storyline, Marissa is introduced to new characters who influence her perspective on life and her personality.