Jay is ninja Master of lightning. Jay to was accepted as ninjutsu-master, Wu's student along with Cole, Kai, Zane, Nya, and Lloyd. Training together would forge a friendship between the students. Jay would develop feelings for Nya, Kai's sister. After the defeat of The Overlord, a period of peace was allowed to the Ninja Masters and it was during this time that Jay found that he and Cole would develop competing affections for Nya. The time was additionally one of grief as team-member Zane had been lost in the battle.
After Zane's death the masters had broken-up their group but were later reunited when they found him alive. The six journeyed to Chen's Island. Cole and Jay resolved their competing interests over Nya, and as the Ninja fought Chen's cursed army. Soon after dealing with Chen's army, Jay and the Ninja would ned to do battle with Morro and his many ghosts. Nya would defeat the ghosts at Stiix by destroying the opening to the Cursed Realm. Once the Cursed Realm was gone, the Ninja's next great foe would be Nadakhan. Nadakhan framed the Ninja and trapped many of them in his sword. Jay would fight side-by side with Nya, but see her killed by Sky-Pirates. Jay used a magical wish to undo recent events, not only freeing his friends but bringing Nya back to life and giving him a chance to rekindled his relationship with her. Jay's final battle would be against the evil Samukai who attacked while Jay was visiting with the spirits of his deceased parents, but thanks to the intervention of the hero Ronin Samukai was overcome.
In Season 8-onward, Jay has curly, Light brown hair, generally wearing blue clothing to represent his Elemental color. He has Light brown eyebrows and Really light freckles. Prior to Season 8, Jay had short, straight, reddish-brown hair, with a notch on his right eyebrow. In addition, he was not shown to have freckles.
While a refined warrior, of his fellow ninja, Jay is the most light-hearted. Jay often tells jokes although of most are only amusing to him. Jay tells his jokes as a coping-mechanism for fear and/or anxiety. While his fellow ninja are easily annoyed by his frequent boasting, Jay remains a good friend to his team-mates. Jay is somewhat high-strung and will almost always be the first to panic as danger presents itself.
Jay is fond of inventing - as his favored color is blue he color-codes his inventions when possible. As Jay was raised in a junkyard he can not help but see the potential in even minor everyday objects other might dismiss as junk or overlook all together. During his crush on Nya it was not uncommon for Jay to nervously stutter when around her.
After being stranded in The realm of Oni and Dragon, Jay had an apparent mental breakdown. He seemed oddly not stressed about anything and the other ninja quickly realized he had lost his sanity. Since than he has apparently returned to normal as evidenced by him freaking out when fighting in the Dragon Hunter Arena which indicates his breakdown was simply temporary and caused by stress.
Powers and Abilities
Jay can harness the power of Lightning to create a Spinjitzu tornado of pure electricity. He can also seemingly fly with his powers as seen in the episode Day of the Great Devourer, although he hasn't used this ability ever since, as it seemed to be part of his True Potential abilities. His lightning powers were enhanced further by the Nunchucks of Lightning, and later by his Elemental Blade. In close-range combat, he favors nunchucks, but has used katanas and various improvised weapons on occasion.
Jay has an eye for machines and gadgets, being in charge of repairing and maintaining the various technology at the ninja's disposal. He was responsible for restoring the Destiny's Bounty to a functional state and equipping it with the modifications needed to make it fly. Over time, his inventing side was less emphasized, due to Nya and Dr. Julien taking up the role of gadgeteer, but Jay's skill with technology should not be underestimated. Prior to "Let's Dance," Jay obtained dancing skills from playing Dancy Pants. He is also able to play the guitar, as shown in Prime Empire.