Arizona Robbins is currently the Head of Pediatric Surgery and a board member at Grey Sloan Memorial Hospital and wife of Callie Torres. She is the mother of Sofia Robbin Sloan Torres.

After completing her residency at Johns Hopkins Hospital, Arizona was hired as a surgical fellow at Seattle Grace Hospital's pediatric surgery department. When head pediatric surgeon Jordan Kenley died, Arizona was promoted to department head and took over Dr. Kenley's cases. She worked together with Alex Karev and Miranda Bailey on Jackson Prescott, a young boy dear to Bailey. They disagreed when Arizona wanted to change Dr. Kenley's course of treatment. Arizona thought it wasn't working, though Bailey fully supported Kenley's plans. Arizona agreed to follow Kenley's course of treatment for another day, but did want to explore other options. She told Bailey they'd meet in the OR as she rolled off on her Heelys, which made Bailey start to dislike her.

The disliking grew in the OR where Arizona said that it was a miracle that Jackson was still alive, as he should've been on the transplant list a year ago. Behind Arizona's back, Bailey complained about her to Richard, though he didn't really listen and he assured her that Arizona was the best. When Arizona told Bailey after surgery to put Jackson on the transplant list, Bailey asked to get a second opinion. Arizona gave her Norman McCale's number, saying he'd totally agree with her plan. Bailey said there was no need to snap, but Arizona found there was. Arizona said that she got that Bailey kept on second guessing her as she liked and trusted Kenley, but she said that she was not the problem. She asked Bailey to start thinking about Jackson instead of her, as he needed all the time he could get. Bailey later realized that Arizona was "okay", which she also told the Chief, to whom she had earlier complained.

Arizona is a lesbian and is currently married to Callie Torres.

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Callie and Arizona

At the Emerald City Bar, she saw that Callie was upset and came to comfort her in the bathroom and kissed her. Callie soon decided to ask her out, but Arizona declined the offer after finding out Erica was Callie's first girlfriend. Her reasons were metaphorical: she deals mostly with newborns at work; she does not want to deal with them in her personal life, but she claimed "[she is] super flattered. Super." at the offer. Annoyed, Callie confronted her, but the situation was made more awkward after she discovered that Arizona was on a date with a woman named Julie.

Callie started to avoid her, but she was eventually cornered in the elevator. Arizona then decided to explain that sometimes she doesn't always make the right choice under pressure and that she was wrong. Callie accepted it and Arizona asked her out again and after pretending not to be interested for a few seconds, Callie accepted.

Their relationship continued, but when Callie's father came to visit and discovered that she was dating a girl, he cut Callie off. Mark and Cristina both suggested that she lie and say she broke up with Arizona, but after Arizona approached her and told her that she loved how Callie cared so much about things and wouldn't care if Callie lied, Callie decided not to lie because her family should accept her.

However, Callie began to withdraw slightly and began to avoid Arizona. Arizona then asked if their relationship was just a fling and it had run its course and Callie told her that it probably was. Arizona later approached Callie and Callie told her the real reason was because she didn't have the money for four-star restaurants anymore but Arizona told her that they could stay in and eat sandwiches. Callie countered that neither of them liked sandwiches, so they settled on pizza instead.

The relationship was threatened again when Callie got annoyed at Arizona for believing that George joining the army was awesome, but after hearing that Arizona's brother died in the war, she apologized.

On Arizona's birthday, after a failed surprise party, Arizona told Callie she loved her, and Callie reciprocated her feelings. Callie was dismayed to learn that Arizona didn't want children. She assumed that Arizona's reluctance was related to her brother's death, but Arizona told her she simply liked her life the way it was. They came to the conclusion that they could not continue their relationship, as they both wanted different things. However, after a shooter entered Seattle Grace with a vendetta for Derek, Lexie, and Richard, they were in lockdown together, and eventually decided to get back together and have kids. They passionately kissed in happiness.

Six months after the shooting, Arizona received word that she had been given the Carter Maddison Grant, and was allowed to go to Malawi and become a doctor there. She had applied for this grant two years previously, when she hadn't met Callie yet. After some hesitation, Arizona decided to accept the grant. In the end, Callie was shown to have accepted this as well and decided to leave with Arizona. However, a fight at the airport resulted in Arizona leaving for Africa without Callie. After some time passed, Arizona came back and told Callie she missed her, but Callie closed the door in her face.

Callie continued to reject Arizona's constant pleading and apologies. Eventually, Callie revealed that she was pregnant with Mark's baby. After asking for time to process, Arizona accepted the situation, and she and Callie restarted their relationship. Callie and Arizona later reconciled and they moved back in together. After seeing the baby's heartbeat for the first time, Arizona referred to the baby as "theirs."

However, tensions continued with Mark in the picture as an active and interested father. Callie gifted Arizona with a weekend getaway, but continued communicating with Mark as she and Arizona drove. Arizona's jealousy came to the forefront, and the two argued, with Callie concluding, "Tell me what you want and I'll do it." After a pause, Arizona said, "Marry me." They had shocked faces as they approached a stopped truck and crashed. Arizona was slightly battered, but Callie (who'd taken off her seatbelt) flew through the windshield. A series of surgeries followed (including the delivery of her very premature baby) along with emotional breakdowns by both Mark and Arizona. Callie eventually woke up and turned to Arizona, who was sitting at her bedside, and whispered, "Yes, I'll marry you." They finally married at a ceremony officiated by Miranda Bailey.