He is handsome, punkish, and mischievous. Being athletic, Jay provides the "brawn" when he and his friends are invited to Auradon Prep. He is a thief, a con man, a handsome, quick-witted boy with charm to spare, whose lies are as beautiful and silvery as his eyes.
He has a penchant for stealing things, which kept him busy at home on the Isle of the Lost. In Auradon, he puts his athleticism to good use as a star player on the tourney team. Through tourney, he is exposed to teamwork for the first time and helps the other villain kids understand its value in executing their plan.
Personality
Jay is a sneaky, confident, and handsome guy. Jay was raised to believe that he must get everything and to forget others as well. He's vengeful like Mal and he's athletic. As the son of Jafar, Jay wants to gain his father's respect by stealing the "big prize". He was Carlos’ best friend. He isn't fond with how friendship works. Jay has always charm his way to get what he wants back on the Isle. Like the others, Jay was never shown affection by his parent so, when he tries out for the tourney team and makes it, he gets a chance to see what's it like to be a part of something as special. He's shown to have kleptomaniac tendencies, as he often steals objects on the fly. He can also be a flirt, having flirted with several girls in the film including Lonnie and Audrey and in Wicked World flirting with CJ. He tends to be very rough and enjoys fighting with others or pushing those that get in his way as shown in his first practice Tourney match. As the film progresses, he grows to believe and enjoy friendship as he tells Mal, Evie, and Carlos they need to work together to steal the wand and even came to the defense of Evie against Chad. By the end of the film, he is determined to become good though he has yet to fully give up his kleptomaniac ways. In addition, he seems to retain his tough confrontational attitude and will get into fights with those who anger him, such as with Carlos in episode 10 of Wicked World.
In the novel Return to the Isle of the Lost: A Descendants Novel, he displays a mild-tempered and smart exterior, as he takes Chad's assault with stride and manages to keep his greed from taking over when confronting the Golden Cobra.
It is shown that Jay, he has matured into the role of an older brother figure within the VK group. Particularly in his protective nature towards the girls, Mal and Evie, in terms of romantic relationships and their enemies. Furthermore, he is shown to be brotherly and jokes with Carlos similar to an older brother to a younger one.
Physical Appearance
Jay is described as a boy with long hair who's muscular. He has dark chocolate eyes, that could charm anyone especially the girls. He wears a yellow and maroon sleeveless jacket with a shade of dark blue, blue jeans, black boots, and a red beanie.
His father taught him "whoever has the most gold makes the rules" - and "there's no "team" in I". The latter is the reverse of the famous saying "there's no "i" in team".
His favorite class in Dragon Hall was Enrichment, as it taught the skills needed for thievery.
Unlike his friends, Jay doesn't even have a bed (mattress in Carlos' case) to sleep on. He sleeps on a rug underneath a shelf in his father's shop, which holds heavy televisions. He's quite lucky to have avoided being crushed to death.
His father depends on him to stock their store by stealing from everyone on the island; from there, Jafar sells their stuff back.
It is also mentioned that he attended Dragon Hall (an evil high school), and has two pet eel sidekicks named Lagan and Derelict. In the present day, they had gotten very large.
In the Disney Descendants Yearbook, it's revealed that Jay's "Secret Wish" is for his father to become a very successful businessman and never have to work again, while his "Not-so-secret Wish" is to be on a winning tourney team.
It is also revealed that he wants to be a professional tourney player (and then coach) when he grows up.
His favorite class is "Basic Chivalry" because of the ladies.
Jay did not inherit Jafar's greed; in fact, Jay considered himself "rich" in friendship, never desiring anything more than what he needs.
Jay's birthday is January 21.
Booboo Stewart, Jay's actor, is the only one of the four original VKs not to wear a wig or have his hair dyed during the filming of the first film, as Stewart's natural hair is the same length and color as Jay's.
Before Hades was revealed to be Mal's father, Jay was the only one of the main VK's to have his father revealed; the others were all with only revealed mothers.
In "Feeling the Love/Did I Mention Mashup" on YouTube, the various clips show Jay's affection, yet it's unclear if they all allude to romance or friendship. The clips featuring the duo with Jay are are when Jay first met Audrey in Descendants, when Jay uses swords to battle Lonnie and when Jay dances with Lonnie in Descendants 2, and when Jay gives Gil a chest bump in Descendants 3.