The two became a popular pairing despite never actually getting together, though a possible relationship was hinted at throughout the show.
The role of Ethan was portrayed by actor Nathan Parsons from January 2009 to July 2015.
The role of Kristina was portrayed by actress Lexi Ainsworth from June 2009 to November 2011. In 2011, Ainsworth was nominated for a Daytime Emmy for Outstanding Younger Actress for her role as Kristina.
The role was portrayed by actress Lindsey Morgan from May 2012 to March 2013.
Ainsworth returned as Kristina in the fall of 2015 and left in the fall of 2017. She returned in 2018, on recurring status.
In the Fall of 2009, Ethan and Kristina struck up a friendship. Kristina became somewhat infatuated with the older and handsome Ethan. At the time, Kristina was dating Kiefer Bauer, who became jealous of her friendship with Ethan. Unbeknownst the everyone, Kiefer was becoming increasingly violent and abusive toward Kristina.
On March 12, 2010, Kiefer overheard a private conversation between Kristina and her older sister Sam about Ethan. He waited until Sam left then confronted Kristina in a jealous rage. A short time later, Ethan found a battered and dazed Kristina, and he took her to the hospital. Kristina panicked and named Ethan as her attacker, but she refused to file charges against him.
Months later, Kristina was attending her father's wedding to Brenda Barrett. After the wedding, Brenda was abducted by Theo Hoffman and Sam was injured in a car bombing set by Theo as a distraction while he kidnapped Brenda. Ethan saved Kristina, and he protected her and Molly during the chaos, prompting Kristina to vow that one day she would marry Ethan.
As Kristina's high school graduation approached, she grew increasingly stressed about her future Psychotic Dr. Lisa Niles gave her "herbal supplements" to deal with her stress, but these supplements, actually turned out to be powerful narcotics. Ethan recognized the pills, and helped Kristina kick her dependency on the pills without anyone discovering her secret.
Kristina became even more infatuated with Ethan and continued her pursuit of him. Ethan, on the other hand remained adamant that they would be nothing more than friends. When Ethan stepped in to protect Kristina from Anthony Zacchara's threats, Kristina took it as a sign that Ethan returned her romantic feelings. Desperate, Ethan enlisted the help of friend, Abby Haver. Ethan made sure to flirt with Abby in Kristina's presence and hinted that they were lovers, but Kristina refused to fall for Ethan's act. Ethan switched tactics by agreeing to spend time with Kristina but on his terms.
Ethan invited Kristina to join him for an overnight trip to Las Vegas, hoping to scare her off, but she called his bluff. Kristina had a change of heart when she overheard Ethan admit to Skye that he felt sorry for Kristina, and he befriended her because she seemed like a nice kid. Kristina was crushed by his words and tossed away the friendship bracelet that Ethan had given her.
Kristina had to undergo surgery to remove a bone fragment from an old injury that had been pressing against an artery in her neck. Ethan visited Kristina in the hospital and promised to dance with her at her sister's wedding when she recovered. After Kristina recovered, she got the news that she had been accepted into Yale University.