Summer Roberts

In the first season of The O.C., Summer was portrayed as a spoiled, rude, rich girl. The snobbiness is on display in the first episode, where Summer is at first attracted to newcomer Ryan Atwood – until she learns he is from Chino, prompting her response, "Chino, ew." Her attraction to him continues afterwards. However, different sides to her character have been shown as she has developed. Before choosing Summer (after her finally showing her feelings for Seth) Seth picks Anna Stern (Samaire Armstrong), who exhibits a similarly strong personality and shares his sarcastic sense of humour and love of comic books, the first go around. After a long wanting from Seth, Summer and Seth begin dating. It is during her transformation that Summer and Seth Cohen (Adam Brody) fall in love with each other. In the process of their characters' relationship, Summer and Seth experience many struggles because Summer thinks it will affect her popular reputation at their high school.

As the season progresses, Summer is affected by their relationship and is often jealous of Seth since he seems to be enjoying Anna's company so much. As a result, Summer gets angry and starts dating a not-so-funny guy named Danny, but that relationship doesn't last long, and Seth is suddenly back on her mind. Midway through the end of the first season, Anna breaks up with Seth because it is obvious he is still in love with Summer. Seth and Summer become a couple, and announce their romance at a school kissing booth, after which they become very close. Summer and Seth lose their virginity to each other. However, as soon as Ryan Atwood (Benjamin McKenzie), Seth's adopted brother, moves away, Seth realizes that the immediate past and present are meaningless, because before Ryan moved to Newport Beach, Seth was a painfully shy social misfit, and he is afraid that since Ryan left, he will once again be alone and the object of ridicule again in Newport. Seth then sails away at the end of the season, leaving behind his worried parents and a heartbroken Summer.

Summer has a new boyfriend, Zach Stevens (Michael Cassidy). Zach is starting to become friends with Seth, whom he met shortly before Zach and Summer started dating, yet their friendship is a little mixed since they both have feelings for Summer. Summer seems committed to putting Seth behind her, although at times it becomes clear that she still has feelings for him. This inevitably causes problems for her relationship with Zach, who suspected they still held feelings for each other. This is further complicated when Summer also becomes professionally involved with Seth and Zach as they develop their comic book, Atomic County, for publication. This relationship proves inextricably linked with the personal feelings all have for each other, and resulted in a bad meeting with a media executive that effectively killed their partnership.

Seth and Summer at their Junior Prom in "The O.Sea" (episode 2.23)

Summer was about to go on an overseas trip to Italy with Zach and his family, when the feelings she still had for Seth prevented her from doing so and she left her heartbroken Zach at the airport, going back to Seth. Zach returned later on in the season however, and this along with Zach and Seth once again going into a partnership for a comic book strained her relationship with Seth. Zach also somewhat subtly exploited this to weaken Seth and Summer's relationship and restart his relationship with her, causing something of a love triangle. The introduction of Reed, a female attractive, older comic book executive who Seth was not initially truthful about also caused difficulties. This was eventually resolved when on the day of the Junior Prom they flipped a coin as to who would go to the prom with Summer and who would meet George Lucas for a comic book project meeting, with Zach winning the date with Summer. However at the Prom both Summer and Zach seemed unhappy with their choices, and at the last minute Seth arrived at the prom to receive the Prom Queen/King award with Summer and reconciled their relationship. Zach apparently succeeded in impressing Lucas and it has been rumored he was given an internship and moved away from Newport as a result, explaining his absence for season 3.

Towards the end of the season Summer also becomes worried about her best friend Marissa's behaviour, unexplained bruises and a tension with her boyfriend Ryan and his brother Trey. She confronts Marissa and Marissa confesses that Trey had attempted to rape her. Summer consults Seth about this, who feels obliged to tell Ryan and as a result the tragic events of Trey's shooting happen, with Seth and Summer arriving at the aftermath of the shooting.

Summer is adjusting to her senior year at Harbor School, with the year starting with her best friend Marissa Cooper expelled from Harbor as a result of her involvement in the shooting of Trey Atwood. As a result, Summer reluctantly seeks a more involved role in student politics, gaining a new rival in fellow student Taylor Townsend (Autumn Reeser). They have since become (albeit at times reluctantly on Summer's part) friends, particularly when Taylor helped her get Marissa back in by organizing a petition. Summer is initially insecure about her relationship with Seth, because she often felt that he was smarter than her and she feared that he would break up with her for someone more like him. However, when Summer gets a very high SAT score, it gives her the ambition to change, and she begins to focus on school. Also, her relationship with Seth is closer than it was during much of the previous year, and the couple's post-graduation future is one that she finds harder to ignore. They have trouble earlier in the season deciding what colleges to go to and how it would affect their future together, but eventually they agree on going to Brown University, which is more feasible after Summer gets a high SAT score. Summer cares a lot about Seth and when he starts smoking pot, she becomes worried about him and forgives him if he promises to stop. When Summer finds out that Seth is still smoking pot, she is upset, but Seth apologizes with a letter on a napkin, admitting his lies and mistakes, and tells Summer that if he messes up again, she can show it to his parents. Summer forgives Seth. Shortly before they get their college acceptance letters, Summer says that if should she get into Brown and not Seth, she will not go. When they get their letters, to Seth's dismay this happens. Seth, not wanting to be responsible for Summer turning down a major educational and life opportunity, says he does not want to go to Brown anymore. As a result, they break up, with Seth stating when confronted by Summer that he does not love her anymore. While their future as a couple seems uncertain at this point (and is complicated by the return of Seth's ex-girlfriend Anna Stern), Summer takes a Korean pop star as date for the prom. Upon seeing Seth with Anna, Summer feels hurt. When Summer falls off the stage after being announced Prom Queen for the second time in a row, Seth runs to her and tells her the truth about Brown and they reconcile. They have resigned themselves to going to school in Rhode Island, albeit at different schools.

Summer has also dealt with several changes in her home life, such as her stepmother, an unseen character, leaving and divorcing her father. Also more recently she has had to deal with her father dating her best friend's mother, Julie Cooper. She eventually accepted the relationship and recently announced engagement, however, seeing the happiness it had brought her father despite her own reservations about Julie.

Summer is adjusting to life in college without Seth and Marissa in an unexpected fashion. She tries to separate herself from Orange County and her former materialistic lifestyle. During the final season, she and Taylor go from being rivals to best friends. Whilst attending college she befriends another college freshman, Che. Che is an environmentalist and Summer joins him in an attempt to take her mind off the death of her best friend, Marissa Cooper. She attends protests, stops shaving her legs and rearranges her dorm to fit her new lifestyle. After some time, she tries to return to her former self, but realizes that she prefers caring about the environment, attending protests and other political pursuits to reading tabloid magazines and watching television such as The Valley. She decides to balance her personality between her two sides. However, her environmental activism creates trouble for herself, when she and Che release lab rabbits from a science lab. When Brown officials investigate the incident, she remains truthful aside for not naming her accomplice. Unfortunately, Che blames her for other protest crimes that have occurred at the university, believing himself fundamental to the environmental movement at Brown, which results in Summer's year-long expulsion. Summer has moved back into her old Newport house with the Coopers and Taylor. Upon hearing of her expulsion, her boyfriend Seth decided to put off college plans until next Fall so they could return to Providence together. Close to New Year's Eve, Summer had a pregnancy scare, which ultimately caused Seth to ask her hand in marriage. Although the newly engaged Summer found out she was not pregnant, plans for their marriage stay the same.

In "The French Connection" Summer meets up with ex-bestfriend Holly Fischer to find out what life is like as a "Newpsie-wed". Summer realizes that she has changed and no longer feels like she belongs with the crowd she used to know. Summer realises that she doesn't know who she truly is and breaks off the engagement (although maintaining a relationship) with Seth in order to find herself. She slowly works toward this as she and Seth re-connect.

Later, Summer helps rescue a groundhog in a political movement when Seth and Che were arrested. Also, in "The Case of the Franks" Summer gets offered a job at GEORGE (Global Environmental Organisation Regarding Greenhouse Emissions) travelling around the country speaking to children in high school. She believes that this is one part of her destiny while Seth is the other.

She challenges Seth to make stock film after he criticizes the films at GEORGE's art show. He mockingly steps up to the plate by filming an inflatable orca and shark in his backyard swimming pool for six hours and says that he took two naps while filming. Summer doesn't appreciate his effort and says that he should stop being lazy and actually do something. During his second attempt, which consists of various adventures of the family, he catches a conversation between Summer and Kirsten. She says that she just wants Seth to be excited about something that he loves. During a trip to rent An Inconvenient Truth, an earthquake hits Newport. Summer and Seth safely get out of Ryan's Jeep when a light pole falls onto it.

Six months later, Seth and Summer fall into a rut after the earthquake, and spend hours watching Briefcase or No Briefcase (a television game show take-off of Deal or No Deal). Seth tells her that she must join GEORGE, and they'll always be together. Summer leaves Seth to help the environment and they say farewell. Summer attends protests and works to save the environment and educate students on environmental issues for a year. She appears in newspaper articles as an environmentalist. In a flash-forward sequence, Summer ends up marrying Seth.