Personality and Talents
Qui-Gon Jinn was described as being a Gray Jedi by his peers and followed the Living Force as much as he did the Council. Obi-Wan Kenobi stated that if he followed the Code he would be on the Council, and despite his unorthodox ways he was a loyal member of the Jedi Order. He was wise and very clever, as well as a great swordsman, often dueling with fellow Jedi Master Mace Windu, although the two of them never bested the other in their duels.
Despite Qui-Gon's Master, Dooku, being a Master of Makashi, Qui-Gon Jinn chose a Lightsaber Form that Dooku deemed to be crude, Ataru, although he was the greatest wielder of the form in over 400 years, if not one of the best Lightsaber swordsmen in over 400 years. He was powerful in the Force and had he not died at Naboo he might have been able to prevent the fall of the Republic.
As an infant Qui-Gon Jinn was taken from his homeworld to Coruscant when he was discovered to be Force Sensitive. He was trained by Yoda and when he was eight years old he became friends with another Youngling named Tahl. When he was ten he aroused the attention of the recently Knighted Jedi Dooku who later took him as his Apprentice.
Qui-Gon was Dooku's first Apprentice and the two of them went on many missions together, including one mission where they were to escort a Senator to a diplomatic meeting, a mission where they were attacked by space pirates and it was discovered that the leader of the pirates was one Lorian Nod, a failed Jedi and former friend of Dooku. Nod and Dooku fought and Dooku came near to killing Nod, but Qui-Gon managed to persaude him not to and thus saved him from the Dark Side. After that the two had one more mission together that lasted two years. When they returned, Qui-Gon reunited with Tahl and Dooku told Qui-Gon that although his compassion for life was strong, it was also his weakness and that inevitably, he'd be betrayed by a friend.
Qui-Gon Jinn became a Jedi Knight alongside Tahl, and when it was suggested that he take a Padawan of his own, he chose not to, and took a number of solo missions because he didn't feel that he was ready. During one of his solo missions Qui-Gon discovered a Force Sensitive called Xanatos whom he took back with him to the Jedi Temple, even if he was older than the normal Younglings brought to the Temple. For two years afterwards Qui-Gon finished the training of another Padawan and thus became a Jedi Master. Soon after this he took Xanatos as his second Padawan. As Xanatos was about to become a Jedi Knight himself, Qui-Gon's last mission with him was to Telos, where he had found Xanatos. Xanatos' father had become a tyrant and tempted Xanatos to join him, which he did. Qui-Gon confronted Xanatos' father and was forced to kill him, and Xanatos scarred himself on Qui-Gon's Lightsaber before taking his father's ring and fleeing, swearing revenge on Qui-Gon.
Because of this, Qui-Gon renounced his earlier success in training his first Padawan and vowed not to take another Padawan as long as he lived. It was a dark time for Qui-Gon and he returned to solo missions, or missions accompanied by Tahl or other Jedi on which they had many successes.
It was years later that Yoda asked Qui-Gon to take on another Padawan, and although Qui-Gon refused he did attend a tournament that showed off the Padawans' abilities, of which Obi-Wan Kenobi was a part of. Although he took note of Obi-Wan's skills he left for Bandomeer, and on the transport he was reunited with Obi-Wan who was to begin his life as part of the Agricultural Corp. The two of them defended a group of Arcona from a criminal organization called Offworld Corporation. Upon arriving on Bandomeer he received a letter from Xanatos, and realised that Bandomeer wasn't in need of Jedi assistance and was all a set up by Xanatos, leader of Offworld and whose mining operations were terrorizing all on Bandomeer. Qui-Gon sent Obi-Wan to his agricultural duties while he met Xanatos as an ambassador to reach an agreement between Bandomeer and Offworld, even though Xanatos planned to sabotage the meeting and kill Qui-Gon. Again Qui-Gon was helped by Obi-Wan and they put a stop to Offworld's actions on Bandomeer and although Xanatos escaped, Qui-Gon saw the true potential of Obi-Wan and took him as his third Padawan Learner.
Qui-Gon and Obi-Wan went on many missions, including rescuing a blinded Tahl which led to Obi-Wan temporally resigning from the Jedi Order, as well as meet Xanatos several more times who nearly assassinated Yoda in the Jedi Temple. Their final confrontation with Xanatos on Telos resulted in his suicide, and it closed a dark chapter of Qui-Gon's life in a disturbing way, despite Xanatos being a threat to the Jedi Order.
Qui-Gon, along with other Jedi, took part in the Stark Hyperspace War, one of the major conflicts before the Clone Wars, where Qui-Gon first encountered and fought against the Trade Federation.
Around ten years before the Battle of Naboo Qui-Gon and Obi-Wan investigated murders where the victims had been drained of their blood. Their investigation led them to meeting Jenna Zan Arbor, a famed scientist. After a while they discovered that a bounty hunter named Ona Nobis was responsible for the murders, although they couldn't work out her client. When confronting Nobis, Qui-Gon jumped aboard her ship and was hit by her blaster fire. He was taken to Jenna Zan Arbor who was conducting experiments on Force Sensitives, and began torturing Qui-Gon and drawing his blood to test his limits. Obi-Wan, along with Tahl and two other Jedi infiltrated Zan Arbor's labs and free Qui-Gon. They captured Zan Arbor and Ona Nobis was presumed dead after a duel with Obi-Wan.
While training with Obi-Wan, Qui-Gon received visions of Tahl in danger and the two returned to Coruscant. Although he requested that he go with Tahl on her next mission, Tahl refused and she left without her apprentice. When Qui-Gon heard that Tahl hadn't been heard from in three weeks, he and Obi-Wan went after her against the orders of the Council and found her safe, although Tahl soon went missing again and was kidnapped by a rebel named Balog who'd drugged Tahl. When Qui-Gon arrived and attempted to heal Tahl with the Force, he failed and Tahl passed away. Qui-Gon became dangerously close to the Dark Side and nearly killed Balog if it wasn't for a voice saying "No, Qui-Gon." Initially he believed Obi-Wan to have said this, but it was in fact Tahl speaking through the Force to him.
Spoilers of Qui-Gon's History Ends Here
The Phantom Menace
Qui-Gon and Obi-Wan were ambassadors sent to the Trade Federation blockade of Naboo by the Supreme Chancellor, although unfortunately for them the negotiations never took place and they had to fight their way off of the Trade Federation battleship and on to some of the droid army's landing craft. On the surface Qui-Gon saved a Gungan by the name of Jar Jar Binks. Qui-Gon and Obi-Wan were led to the Gungan underwater city by Jar Jar, who was to be punished for being clumsy by the bosses. Qui-Gon managed to Mind Trick Boss Nass, the leader of the Gungans, into letting Jar Jar come with him and to give them a transport to get to Theed. In Theed Qui-Gon and Obi-Wan saved Queen Amidala and escaped on a Naboo Cruiser past the blockade, although the hyperdrive generator was damaged and they stopped at Tatooine in an attempt to get a new hyperdrive generator.
It was on Tatooine that Anakin Skywalker, the Chosen One, was discovered by Qui-Gon and he helped the boy build a podracer that he could race in the local race. He had a bet with Watto in order to free the boy and to get a hyperdrive generator and Anakin managed to win the race. Qui-Gon and Anakin left for the Naboo Cruiser, however as they approached Darth Maul showed up. Qui-Gon got Anakin to get the ship to take off while he dueled with the Sith, before jumping on the entrance ramp as the ship flew back into space.
On Coruscant Qui-Gon informed the Council of Anakin and insisted that he was the Chosen One, and when they refused to train him themselves he said he'd take Anakin to be his Padawan, saying that Obi-Wan was ready for the Trials to become a Jedi Knight. The Council refused and Qui-Gon instructed Anakin to watch him closely. Back on Naboo Qui-Gon and Obi-Wan helped Amidala get to the hanger before the two Jedi defended the Queen against Darth Maul.
While fighting in an impenetrable laser security system Obi-Wan was cut off from Qui-Gon, which resulted in his death along with his presumed tiredness through his use of Ataru, the lack of defense because of the confines of the room of which they fought in. Darth Maul stunned him and then stabbed him with his Lightsaber. Qui-Gon spoke briefly with Obi-Wan after he'd killed Darth Maul and instructed him to train the boy.
Qui-Gon was one of the few Jedi who managed to become one with the Force. As a Force Ghost he took on another Apprentice very briefly in Yoda, teaching him how to become one with the Force. Qui-Gon had to let his compassion guide him, as well as being selfless and rejecting personal attachment so that the body fades but the consciousness remains within the Force.