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Early biography
Jake was born and raised on Earth. Like his twin brother, Tom, he and his childhood fascinated with stories of great heroes. Unlike Tom, who was drawn to science, Jake chose the path of the Marines—he says he wanted to test himself and find his worth.
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While serving in Venezuela, Jake suffered a severe spinal injury that left him paralyzed from the waist down and forced to use a wheelchair. Veteran's benefits weren't enough to cover his treatment.
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Appearance on Avatar
One day, RDA agents find Jake in a bar. They inform him of the death of his twin brother, Tom, a scientist who participated in the Avatar program. Because of their identical DNA, Jake agrees to replace his brother and travel to the planet Pandora to participate in the program.
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The program involves the creation of hybrid bodies of Na'vi (the indigenous inhabitants of Pandora) and humans, which are remotely controlled by human pilots.
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Life on Pandora
After a nearly six-year journey, Jake arrives on Pandora and connects to his avatar via a neural link. In this body, he can use his legs for the first time in many years and attempts to walk, which comes as a surprise and joy to him.
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While on patrol, the avatars of Dr. Grace Augustine and Norm Spellman are attacked by a thanator predator. Fleeing, Jake encounters Neytiri, a huntress from the Omaticaya clan. She rescues him and leads him to her clan, believing Jake's appearance to be a sign of destiny.
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Under the guidance of his mother, Neytiri Mo'at, Jake gradually assimilates among the Na'vi, learning their customs and languages. Gradually, he falls in love with Neytiri, becomes imbued with Na'vi culture, and sympathizes with their struggle against corporate expansion.

The seizure and its interpretation
While interacting with the Tree of Life, Kiri sees a vision of her biological mother, Dr. Grace Augustine. She asks Grace who her father is, but before she can answer, she is consumed by an unknown force. At that moment, Kiri begins to convulse.
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Dr. Norm Spellman, who conducted the tests, suspects she has frontal lobe epilepsy. However, many viewers and analysts believe the seizures are caused not by the illness, but by Kiri's special connection with Ava, the goddess of Pandora, who unites all life on the planet.
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There are several versions of why this happened:
Excessive power surge. Kiri activated her abilities quickly and without proper preparation, which could have caused an undesirable reaction.
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Connection with Eywa. Perhaps the connection with Pandora's divine essence caused an adverse reaction.
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Origin details. There are theories that Kiri is an immaculate being, born of Eywa rather than biological laws. In this case, the seizure may be related to the fact that Eywa is already a part of her being.
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The Origin of Kiri
Kiri is the adopted daughter of Jake Sully and Neytiri, and the biological daughter of the avatar Dr. Grace Augustine. She was born parthenogenetically (without the intervention of a male), making her genetically identical to Grace and effectively her clone. Because Grace had an avatar body, Kiri has some human features, such as eyebrows and five fingers.
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The mystery of Kiri's origin remains unsolved. James Cameron hasn't confirmed any of the theories, but based on visual clues (the flora's reaction, Kiri's connection to Eywa), the most likely theory is one of divine origin.

Some facts about her biography:
born in 2163;
species - a hybrid of Na'vi and Avatar;
height - 170 centimeters;
formerly belonged to the Omaticaya clan, later transferred to the Metkayina clan;
has two older biological brothers, Neteyam and Lo'ak, and an adopted sister, Kiri.

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Due to her young age, Tuk was often not allowed to participate in dangerous rituals, such as her older brother Lo'ak's Iknimaya, leaving her in the care of other clan members.

Early years and education
Neytiri was born into the Omaticaya clan, the daughter of Chieftain Eytukan and spiritual leader Moat. Like all Na'vi, she grew up learning through song and dance, celebrating her connection to Eywa (the universe) and the nature of Pandora.
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When humans arrived on Pandora, Neytiri's parents, on Grace Augustine's advice, opened a school where English could be taught. Neytiri became one of the top students and quickly mastered the language.
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However, the situation changed after the 2152 incident: a group of children led by her older sister, Sylwanin, set fire to a bulldozer, and RDA Security Service soldiers pursued them to the school. Sylwanin was killed in the attack, and the school was closed.
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After this, Neytiri became engaged to Tsu'tey, the fiancé of her deceased sister.
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Meeting Jake Sully
One day while hunting, Neytiri encountered Jake Sully in her avatar body. At first, she was prepared to kill him as an outsider, but Eywa's intervention and the Tree of Souls seed on the tip of her arrow changed her mind. Neytiri became Jake's mentor, teaching him the Na'vi language, archery, hunting, and other skills.
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Neytiri later learned that Jake was connected to Colonel Miles Quaritch, who sought to destroy the Tree of Souls, a vital Na'vi site. This left her angry and disappointed.
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Tragic events of the war
During the conflict with the humans, Neytiri's parents, Eytukan and Moat, died. Neytiri herself fought alongside Jake in the battle at the Tree of Souls and saved him by killing Quaritch.

Early life and feelings of otherness
Lo'ak was born a year after his older brother, Neteyam. He was the only one of Jake's three biological children to inherit his avatar traits—five fingers and barely noticeable eyebrows. This made him physically distinct from other Na'vi, who typically have four fingers. Lo'ak also had a fiery temper.
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Because of his differences, he felt like an outcast within his family and clan. His closest companion was his adopted sister, Kiri—though they sometimes fought over toys, they both shared some human features. Lo'ak also became close friends with the human boy, Spider Socorro.
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Grandmother Mo'at taught him how to weave Omaticaya bracelets.
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Traumatic events
Falling off a cliff while attempting to tame an ikran. During his first attempt, Lo'ak was unable to control the animal, fell off the cliff, and lost consciousness. Afterward, he was unable to repeat the attempt for a long time, but eventually successfully established a tsaheyla with another ikran.
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Encounter with the Recombinants. After an attack by Miles Quaritch and his minions, Lo'ak's family was forced to flee to Clan Metkain.
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Neteyam's Death. At the end of Avatar: The Way of Water, Neteyam died saving Spider. After this, Lo'ak became the eldest child in the family. He felt guilty for his brother's death.
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Mental disorders
Viewers and analysts note that Loac may exhibit symptoms of depersonalization-derealization disorder—a way to cope with the trauma and violence of war. He has also been diagnosed with generalized anxiety disorder (constant excessive worry, fear, irritability, and difficulty concentrating) and post-traumatic stress disorder (PTSD).

Olangi (Riders of the Plains)
It lives on wide open plains outside the rainforest.
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Peculiarities:
nomads, constantly moving from place to place following animal migrations;
are considered the most skilled riders on dire horses;
a proud and independent clan that values ​​freedom above all else.

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After the Battle of the Tree of Souls, the surviving members of the Olangi clan were adopted into the Omaticaya clan.

Tayrangi (Ikran People of the Eastern Sea)
Lives on the coast of the East Sea, on steep rocky shores.
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Peculiarities:
They are known as outstanding aerial riders and masters of underwater hunting: riders and their winged companions dive into the waves at high speed and spend several minutes under water;
use crayfish to hunt marine animals, which form the basis of their diet;
joined the alliance of clans that formed to fight the RDA during the events of the first film.

Metkayina (Sea Clan)
Lives on the reefs of the Eastern Sea. One of the largest reef clans.
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Peculiarities:
biologically adapted to a semi-aquatic lifestyle: they have larger eyes (probably for better vision in limited underwater light), wide forearms and shins resembling flippers, powerful flat tails for fast movement underwater;
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the skin is lighter turquoise with wavy stripes, on the chest and stomach it is noticeably lighter than on the back;
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They live in wicker huts called marui, built into the roots of mangrove trees;
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have close relations with the tulkuns, intelligent sea creatures similar to whales: each clan member among the tulkuns has a spiritual brother or sister;
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use sign language for underwater communication and communication with tulkuns;
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People actively tattoo their bodies—tattoos reflect a person's life and have symbolic meaning.
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One of the most important rituals is the First Breath: the baby is born right in the sea, in shallow water, and must independently float to the surface to take its first breath.

Omaticaya (Blue Flute Clan)
One of the central clans, inhabiting the tropical forests of Pandora. The main characters, Jake and Neytiri, belong to it.
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Peculiarities:
known for their skill in weaving and creating complex textiles;
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deeply spiritual, they worship the Tree of Souls and the goddess Eywa;
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make combat bows from the Tree of Souls;
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They call themselves the "Blue Flute Clan" because they believe that Eywa created this flute from the Tree of Souls - with its help the leader communicates with spirits, ancestors and Eywa;
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From early childhood, children prepare themselves for their future initiation: they master the skills of a hunter and understand the connection between the forest and the people.
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The Omaticaya were the first clan to make contact with humans. After the massacre perpetrated by RDA soldiers in 2152, they ceased contact with outsiders for a long time.