2002–2008 Kristina is born on-screen on November 19, 2002, to
Alexis Davis and her then-fiancé,
Ned Ashton; named after Alexis's late sister,
Kristina Cassadine and Sonny's late mother, Adela Corinthos. After a one-night stand with mob boss,
Sonny Corinthos, Alexis learns she is pregnant and tries to pass the child off as Ned's. Ned agrees to pretend to be Kristina's father to protect her from Sonny's lifestyle. The truth comes out when Kristina becomes ill and stem cells from Sonny's stillborn
daughter with
Sam McCall are used to save Kristina's life; Sam would later turn out to be Alexis's long lost daughter. After a court battle, Alexis and Sonny agree to share custody of Kristina, but she would live full-time with Alexis, and Sonny would be allowed to see her whenever he wanted. Kristina is officially christened as Kristina Adela Corinthos-Davis with
Ric Lansing and
Carly Corinthos as her godparents. Soon after, Carly and Sonny's sons,
Michael and
Morgan, are kidnapped by , but rescued by Sam and
Jason Morgan. When Alexis is diagnosed with cancer, Kristina briefly lives with Sonny and Carly. When Kristina witnesses Sam shooting
Diego Alcazar, she goes into a trance like state for weeks. She eventually recovers and breaks her silence on Christmas. Kristina goes silent again when she sees Diego alive as the Text Message Killer. After Michael is shot and rendered comatose after an attempt on Sonny's life, Alexis reinforces Sonny staying away from their daughter.
2009–2011 Kristina reappears as a teenager who is acting out. She feels that her father does not spend enough time with her, and she is unable to live up to her mother's expectations. Sam tries to give Kristina advice to make herself happy rather than impressing her mother. When Michael wakes up from his coma, Kristina is thrilled to have her brother back, but Alexis wants them to stay apart, thinking Michael will cause trouble. Kristina rebels against this, and spends time with Michael, Morgan, and her younger sister,
Molly Lansing. One night, Kristina drives home upset and crying, and causes her stepmother,
Claudia, to crash and miscarry her child. Sam suspects Kristina is responsible, but Michael confesses and leaves town. Kristina, guilt-ridden, runs away with Michael to Mexico. They are taken hostage by
Jerry Jacks briefly, but escape and are later brought home by Sam and Jason. By this time, Kristina is revealed to be the driver who caused the accident, but Alexis confesses to protect her. Alexis lets Sonny spend time with Kristina, hoping to help her heal. Kristina is dating her classmate,
Kiefer Bauer, but he is emotionally and physically abusive towards her. The abuse eventually lands Kristina in the hospital. Kristina initially lies, and claims that
Ethan Lovett attacked her, afraid that Sonny will kill Kiefer. Her lie is exposed when Kiefer beats her again. Kiefer dies when Alexis runs him over while taking Kristina to the hospital. Kristina blames herself for Kiefer's death. Alexis is not charged, and Kiefer's father,
Warren, is furious. He tries to get Kristina to accuse Ethan again so Alexis will be charged. Kristina refuses, and Warren becomes deranged, opening fire within General Hospital, and tries to kill Kristina. He is gunned down before he can, and Kristina tries to heal with the help of her family. Kristina has a crush on Ethan, but he never reciprocates. When Claudia is killed and Sonny is accused, Kristina pushes her father away, until Michael confesses to the murder. Kristina is heartbroken when Michael goes to prison. Upset with Sonny, Kristina pretends to date mobster
Johnny Zacchara to anger Sonny. Unfortunately, Kristina is nearly killed when Sonny plants a bomb in Johnny's car, and two agree to end their charade. Kristina is aboard the General Hospital ski trip bus when it crashes. She survives, but her friend, Ali, dies, leaving her devastated. She's consoled by Sonny, and the two start to mend their relationship. When Kristina becomes a nanny for
Emma Drake,
Lisa Niles tries to get her hooked on drugs, claiming they're herbal supplements. Fortunately, Ethan discovers this, and helps Kristina get clean. Kristina applies to Yale, her mother's alma mater, but she is wait-listed. Disappointed, she tries to get a job at Crimson Magazine under
Kate Howard. However, she later gets accepted into Yale, and leaves town to attend college.
2012–2013 Kristina returns to Port Charles after disappearing from campus weeks prior. Having learned of her parents schemes to get her into Yale and being outcast as the "Mob Princess", Kristina starts a reality show appropriately titled
Mob Princess to teach her parents a lesson. Her family believes she is allowing her producer,
Trey Mitchell to manipulate her because she is attracted to him. After months of forcing cameras on her family, Trey suddenly shuts down the show so he and Kristina can date. Trey later tells Kristina to believe the production company will sue him if he doesn't deliver a show and he tricks her into marrying him in
Las Vegas on camera. Kristina's initial plan is to have the marriage annulled, but after she and Trey consummate the marriage, she refuses. Trey later reveals that he's the son of Kate and
Joe Scully Jr., Sonny's mob enemy. Realizing he lied to her, Kristina is initially furious with Trey. Soon after, though, she is kidnapped by Joe, who intended to kill her, so her inheritance would go to Trey. His plan is interrupted when Trey arrives and stops his father. In the aftermath, Kristina and Trey sign the annulment papers. After Joe dies, Kristina comforts Trey. Kristina and Trey reconcile, and decide to move to
Los Angeles together. Before they can, Kristina and Trey are involved in a car accident with Kate, and Trey ends up brain-dead. Trey dies soon after, and Kristina is furious, blaming Kate, who is under the influence of her alternate personality, Connie. Kristina attacks her, wanting payback, and ends up getting arrested. At the hearing, Connie takes back her statement and Kristina is sentenced to 500 hours of community service. After finishing her community service, Kristina enrolls in
Wesleyan University.
2015–2017 Kristina returns to Port Charles, following her father's shooting. Kristina later reveals that she was suspended from Wesleyan for trying to offer sex to a professor in exchange for a better grade. She tries to hide it from her parents, intercepting any emails or letters sent from Wesleyan. However, Alexis and Sonny find out, and Kristina admits her mistake. The professor she tried to seduce is revealed to be a woman named
Parker Forsyth, and Kristina admits that she's questioning her sexuality. While Parker continuously tries to keep Kristina at arm's length, claiming it would ruin her career and her marriage, it doesn't do much to keep Kristina at bay. After Kristina kisses Parker, Parker proclaims that they can't be together and Kristina tried to move on with her new boyfriend Aaron. After being seemingly happy with perfect boyfriend Aaron, Kristina goes to see Parker again but this time to tell her she's moving on. However, once it's revealed that Parker's marriage had ended, Kristina makes a move and they have sex. Parker considered it a mistake, that she needed more time to piece her life back together but Kristina convinces her to give their relationship a try. However, Alexis runs into Parker on her way to lecture and furiously pushes her into breaking up with Kristina. Parker leaves a letter explaining that she and Kristina have no future together and she leaves town without saying goodbye. Kristina is heartbroken and works on moving on. She tells her boyfriend Aaron about how she cheated on him and Aaron breaks up with her. Aaron isn't seen onscreen again. Some time passes and Kristina calls Parker in a drunken stupor to voice her anger at her for leaving but settled for leaving a voicemail. Molly intervenes and takes Kristina home. Later Kristina sees that Parker called her back and rushes to campus to rekindle their relationship. Parker claims it was an accident and admits that she's getting back with her wife to fix her marriage. Kristina is furious and yells at Parker for being selfish and using her and then leaves. There is a mention of Parker when Kristina's brother, Morgan, dies in a car explosion meant for Julian. Kristina steps up to comfort her father, Sonny, who blames himself. Kristina's character matures while dealing with Morgan's death. Parker sends a sympathy card with her wife's name also written on it. Kristina admits that she still dreams about Parker. Time passes and Kristina and Molly are enrolled at Port Charles University when Molly's class is assigned a different teacher before the semester begins. They are shocked to realize it is Parker. Kristina tried to decide how to handle the situation but Alexis finds out first when they meet Parker at a park concert in town. Alexis is furious and tries to drive Parker away but Kristina fends her off, claiming she could take care of her own life and that she needs to stop controlling hers. Alexis leaves and Kristina goes to seek out Parker. They talk and Parker reveals her marriage was officially dead. They flirt but ultimately Parker can't risk her career and this time Kristina doesn't push it. Kristina, still having feelings for Parker, tries to take her mind off her by going to a "Ladies night" at the Floating Rib with Valerie as her wing woman. Valerie points out that a woman is giving Kristina "looks" and it turns out to be Parker. Parker is playing pool with another woman. Kristina tells Valerie about their one-night stand and how Parker dumped her and Valerie decides they should make Parker jealous and starts to kiss Kristina. Parker is visibly upset by this. Later Parker helps Kristina take care of Scout while Sam is at the hospital with Jason. They talk and Parker admits that she isn't dating anyone. Valerie walks up to them and poses as Kristina's girlfriend, still trying to make Parker jealous and Kristina plays along, trying to move on from her former professor. The story is rushed after this. Kristina decides that she doesn't want to lie to Parker, even to save their feelings and confesses that her and Val weren't ever a couple. Parker insist that they go somewhere to talk. At lunch, they both admit they still are attracted to each other and Kristina kisses Parker again. Parker can't and won't risk her career however and claims again that they couldn't be together and apologizes for leading her on. Kristina comes to the decision to put her happiness first and drops out of PCU, since she couldn't focus on her classes and her grades were poor anyway. Not being a student anymore, Parker asks Kristina out to dinner and they official go on a date. During the date, they talk of Morgan's death, among other things and Kristina admits that she hadn't told her parents they were together but she wasn't going to hide it either. She would tell them later. Parker asks for the check so they could "go to her place for coffee". They kiss very publicly and they decide to "skip the coffee". The next day Kristina walks Parker to her class after spending the night together and the Dean promptly comes in and fires Parker since she was reportedly caught kiss Kristina while she was still a student. They are both devastated. Kristina's mother, Alexis comes into the room shortly after and demands that Parker stay away from her daughter. Kristina accuses her mother of reporting Parker to the Dean but she denies it. Finally stepping up to Alexis, Parker admits that she's in love with Kristina and that her being fired doesn't change anything. Alexis accuses Parker of manipulating Kristina and Kristina tells her that Parker never did anything inappropriate and that Kristina started it all and pushed for it. Alexis refuses to believe it. Kristina asks Parker what she will do without her job and Parker admits she has a house her parents left her in Oregon that's in a college town. Kristina proclaims she's going with her, only if Parker wanted her there. Parker agrees and they run away to Oregon, to have a happy life together. ==Reception==