Daya lived with her mother, Aleida Diaz, and four younger siblings, along with her mother's drug dealer boyfriend, Cesar. Daya served as the main caregiver for her siblings while her mother was treated to expensive dinners and flirted with men. This upset Daya and caused a distaste for her mother. After her mother took the fall for her boyfriend, Daya and her siblings visited her in prison, but their mother appeared to take no interest in them, and asked them why Cesar wasn't visiting and accused Daya of having sex with him, which caused Daya to become more angry. Daya later began a relationship with Cesar in retaliation against her mother.
She is later sent to prison for drug-related charges and arrives along with Piper and Watson. On her first day, she is slapped by her mother. Gloria Mendoza is assigned to be her sort-of mentor, but Daya is criticized by her for not being able to speak Spanish.
She gets pregnant by CO John Bennett, but follows a plan concocted by her mother, Mendoza, and Red that places blame on Pornstache and gets him suspended, much to her dismay as she wants Bennett to take claim for his responsibilities and his child.
Dayanara is quiet and laid back. She does not speak Spanish, which draws the annoyance of Mendoza. She enjoys reading, eating macaroni, and drawing manga. Having found a manga book in the trashcan at a younger age, she has been drawing ever since. She believes the girls in the book are more beautiful than Disney princesses. At first, Dayanara is embarrassed by the hobby, but with Bennett's praise, she begins drawing pictures for him on the back of their note exchanges. She drew comics for the short lived Litchfield newsletter "Big House Bugle"
Daya is shown to be a very caring and loving person, especially when it comes to her siblings and John Bennett, with whom she shares both a romantic and sexual interest in.
Later on, the prison inmates learn of her pregnancy, though they do not know Bennett is the father. Pornstache takes the blame for it and goes to prison for sexual assault. This causes Dayanara to feel extremely guilty because he is innocent of the charges, and furthermore, she suggests to Bennett that they come clean about the situation. Though this will mean repercussions for both of them, Dayanara believes this is the only way they can be a proper family for their child.
Dayanara has dark brown eyes and blonde
/brown (naturally brown) wavy hair. She is of average height and has a curvy figure.
|Season 1 Appearances|
|"I Wasn't Ready"||"Tit Punch"||"Lesbian Request Denied"||"Imaginary Enemies"||"The Chickening"|
|"WAC Pack"||"Blood Donut"||"Moscow Mule"||"Fucksgiving"||"Bora Bora Bora"|
|"Tall Men with Feelings"||"Fool Me Once"||"Can't Fix Crazy"|
|Season 2 Appearances|
|"Thirsty Bird"||"Looks Blue, Tastes Red"||"Hugs Can Be Deceiving"||"A Whole Other Hole"||"Low Self Esteem City"|
|"You Also Have a Pizza"||"Comic Sans"||"Appropriately Sized Pots"||"40 OZ of Furlough"||"Little Moustachioed Shit"|
|"Take a Break From Your Values"||"It Was The Change"||"We Have Manners. We're Polite."|
- "Fuck diamonds, I got spinach!"
- — Dayanara Diaz