Jinora was born to Tenzin and Pema during 160 ASC on Air Temple Island. She grew up as one of two airbenders in the world, later to be joined by her sister when she was three, and her brother when she was five.
During fall of 170 ASC, Jinora and her family traveled on Oogi to the Southern Water Tribe compound to meet Korra, who was due to start her airbending training with Tenzin. Once they arrived, Jinora happily greeted her grandmother, Katara, and told her that she had been reading all about her old adventures, and had been "dying" to ask her what happened to Zuko's mother. Katara began to explain, calling it "an incredible tale", but was interrupted by Ikki, which greatly annoyed Jinora. The next day, the ten-year-old and her family had to leave the South Pole to return to Air Temple Island, as Tenzin had only come to inform Korra about his duties in Republic City, which made it impossible for him and his family to stay at the compound.
After Avatar Korra ran away from her compound and traveled to Republic City, she finally convinced Tenzin to allow her stay on his island so he could teach her airbending. At this decision, Jinora and her siblings excitedly hugged Korra, celebrating her stay.
When Korra began her training, Jinora demonstrated the proper way to navigate through the spinning gates, afterwards speeding them up with a blast of air. She tried to offer advice to the Avatar, but ultimately Korra failed to make it to the other side. After destroying the training relic in a fit of frustration, the Avatar snapped at Tenzin, calling him a bad teacher and storming away. Jinora and Ikki responded by hugging and comforting their father as their little brother kicked around the charred and splintered remains of the gates, mimicking Korra.
At dinner that night, Jinora was reading a book when a frustrated Tenzin demanded that his children promise him that they would not grow into hot-headed teenagers like Korra, to which Jinora emotionlessly replied that she would make "no such promises" and continued to read her book.
While helping Korra out in her bending training, she and Ikki asked her about her personal feelings toward the approaching Mako, which prompted the embarrassed Avatar to launch them into the air with earthbending, though the girls used airbending to land gently, giggling afterwards.
Jinora sat quietly at her family's dinner table as CouncilmanTarrlok entered and offered Korra to join his task force. Along with her family, Jinora later attended the party Tarrlok threw in honor of Korra.
After delivering fruits for the ring-tailed winged lemurs to eat, Jinora pressed Korra if she pursued her potential feelings for Mako, observing that they were spending "a lot of time together". While Korra hurriedly denied this, she asked what she could do, pretending for a second she was interested in him. Jinora gave Korra advice on how to approach Mako based on a historical saga she had read, namely how the heroine, while riding a dragon, burned down the entire country and jumped into a volcano. After Ikki's advice involving a love potion, the Avatar was more inclined to take Jinora's suggestion, believing that it made more sense. They were interrupted by Pema, who had overheard their conversation. Jinora and her sister were then surprised to learn that their father was in love with someone else before their mother. After Pema told them what she did to win Tenzin's heart, all three girls thought Pema's advice was the best alternative.
When Mako, Bolin, and Asami arrived on the island, she welcomed them and shared facts about the fire ferret species. She later showed Mako and Bolin to the boys' quarters.
When the island was attacked by Equalists, Jinora, along with Ikki and Meelo, battled the Equalists and successfully took them down after Lin Beifong was briefly incapacitated by the Lieutenant, all three showing impressive bending skills. Jinora was the first to attack, flying down into the midst of the Equalists using her glider and shouting at the chi blockers to "stay away from [her] dad's ex-girlfriend". After the battle, Jinora and her siblings met their new baby brother. Jinora was curious if her parents had chosen a name yet and if not, if she could she name him. Her parents then told the kids that their brother's name was Rohan. Soon enough, more Equalist airships started invading the island, so Jinora and her family then tried to flee Air Temple Island to a safer location, in order to protect the last airbenders.
However, Jinora and the rest of her family were captured by Amon, who intended to publicly remove their bending and destroy the last airbenders at a rally in the Pro-bending Arena. Avatar Korra and Mako swiftly came to their aid, and Korra led Jinora and the rest of her family out into the hallways of the Pro-bending Arena. Tenzin led his children to find Pema and Rohan while Korra and Mako defeated Amon.
Once Republic City was safe again, Jinora returned to Air Temple Island with her family. She witnessed her boisterous uncle, Bumi, enter the harbor with the rest of the United Forces, much to Ikki's enjoyment and Tenzin's embarrassment. Jinora traveled with her family, as well as the rest of Avatar Korra's friends and family, to the Southern Water Tribe to have Katara attempt to restore Korra's bending. When Katara was unable to heal Korra, Jinora stood by her family, who tried to tell her it would be all right. Jinora witnessed Korra use energybending to restore Lin's earthbending, and watched Tenzin praise Korra for her accomplishments as the Avatar.
Six months after the events of the Anti-bending Revolution, Jinora competed in an air scooter race on Air Temple Island with Korra, Ikki, and Meelo. Jinora came in third, only beating her brother.
Jinora is a quietly reserved, intelligent, studious girl; much different from her younger, more rambunctious siblings. Out of Tenzin and Pema's four children, she is the calmest and most mature. She enjoys reading historical fiction, as well as her father's journals which chronicle his adventures with her grandfather, Avatar Aang. She is also beginning to find boys interesting, which troubles her father greatly. Jinora also likes to play Pai Sho.
Even though Jinora is still an airbender-in-training, she has displayed an excellent variety of airbending skills. This was evident when Korra earthbent Jinora and Ikki into the air and she used airbending to glide down, and later when she defeated the Lieutenant when Air Temple Island came under attack. Also, she is able to use a glider and has mastered the air scooter, a move invented by her paternal grandfather, Aang. Her skills in combat and natural agility allow her to go toe-to-toe with even the most agile of Equalist chi blockers. Her airbending abilities also supplement her fighting skills by giving her the element of surprise so that she may gain the first strike, as well as extreme mobility. She is also able to generate enough air to spin the airbending gates.
Jinorasa was the name of a lesser-known Buddhist writer and poet. Coincidentally, Jinora is also a well-read girl, having encyclopedic knowledge on various subjects, such as being able to identify a fire ferret on the spot and recite its natural habitat.
Jinora is the first female airbender to be born after the Air Nomad Genocide and she is also the first airbender known to have a non-bender parent.
Unlike her parents and siblings, Jinora has brown eyes.
Like her father, Jinora is more serious and mellow, unique among her two oldest siblings whose personalities are hyper and playful.
Jinora and her sister Ikki are the first and only pair of sisters to be seen or mentioned in The Legend of Korra series, second in both series after Azula's advisers Lo and Li.
Jinora has a special relationship with her aunt, Kya.
Jinora and her siblings never met their grandfather, Avatar Aang.