Qui-Gon also appeared as a Force ghost in one of the short stories of From a Certain Point of View, "Master and Apprentice," and his voice, along with the voices of other Jedi, was heard in both "There Is Always Another," and during the climax of The Rise of Skywalker on Exegol.
Qui-Gon Jinn's appearance as a Force ghost represents closure for Obi-Wan, who overcomes his sense of failing his former master. Qui-Gon's absence at the victory celebration on Endor makes sense because the Force ghosts present were all significant to Luke Skywalker's story, which Qui-Gon wasn't directly involved in.
Force Ghosts have become part of the Star Wars franchise's lore, expanded upon in movies, numerous canon tie-ins, and even the Obi-Wan Kenobi Disney+ TV show. Some of the greatest Jedi returned as Force Ghosts: Qui-Gon Jinn, Yoda, Anakin Skywalker, Luke Skywalker, and Leia Organa.
It's likely Qui-Gon Jinn would have refused to serve in the Clone Wars. Had he failed to convince the Jedi of their shortcomings, he may have considered leaving the Jedi Order, but certainly not joining their enemies. But Dooku was foolish to believe Qui-Gon would be so easily swayed by the dark side.
Force ghosts only appearing to Force-users makes sense on a thematic level. The ghosts are said to comprise entirely of Force energy - sentient manifestations of the mysterious, unseen energy the Jedi wield. It's logical that only those who can use the Force themselves can see the spirits it creates.
Obi-Wan Kenobi Meets Qui-Gon Jinn Force Ghost | Finale Part 6 Season 1 Episode 6
Who taught Qui-Gon Jinn to be a Force ghost?
As explained in Star Wars: The Clone Wars season 6, Qui-Gon Jinn learned the secret of becoming a Force ghost from a group of beings known as the Force Priestesses; both the original script for Revenge of the Sith and Qui-Gon's official databank entry mention him learning the ability from a shaman of the Whills (via ...
Why didn't Mace Windu showup as a force ghost? Qui Gon died before he could finish his training so he can only appear as a voice and not a physical form. Mace Windu never studied or trained in that aspect of the force.
Darth Sidious, was in the earliest stages of his plan to take over the galaxy, and he was afraid a certain Jedi might get in his way. Interestingly, however, that Jedi wasn't Yoda or Master Windu, but instead Qui-Gon Jinn.
Even though Palpatine was far more. powerful than Qui Gon, there was no Jedi he feared more, save maybe Yoda. This was largely due to the fact that Qui Gon was. unlike most Jedi of the time.
Whether Vader thought of Qui-Gon specifically was not mentioned. However, it was safe to say he most likely did. Vader felt regret over how he disappointed everyone who cared about him, like Obi-Wan, Padmé, Yoda, etc.
These characters include Ahsoka Tano, Kanan Jarrus, Luminara Unduli, Aayla Secura, Mace Windu, and Adi Gallia. While those mentioned have never appeared physically as a Force ghost, their Force connection with Rey can surely be classed as a Force ghost appearance in Star Wars canon.
The closest that Star Wars canon has come to naming who trained Yoda was revealing that Jedi Master Qui-Gon Ginn was the one who taught Yoda to become a Force Ghost and attain immortality.
In material that is now considered Legends, Qui-Gon is even described as a Gray Jedi. Additionally, the term has also been applied to Force-sensitives who aren't affiliated with the Light or Dark side of the Force. Quite literally, these Gray Jedi don't see things in black and white, or light versus dark.
It's assumed that Qui-Gon began these trials long ago, but was not able to complete them before being killed by Darth Maul. That, in turn, explains why he never appeared during the prequels or anything after. Yet with the ending of Obi-Wan Kenobi, Qui-Gon has seemingly found a way to appear as a Force-ghost.
Star Wars has officially confirmed Sith spirits are in no way comparable to Force Ghosts. The idea of Force Ghosts runs all the way back to the first Star Wars film released in 1977, in which Obi-Wan Kenobi allowed himself to be cut down by Darth Vader.
But Qui-Gon's body remained because I guess he skipped class on that day when the Priestesses were teaching him. While he did still become one with the Force, he didn't do it to the same extent as the others. It's called a rice ghost. We have force ghost thanks to Qui-Gon.
She may have not been a powerful Jedi warrior, but few can say Jocasta Nu didn't play a vital role in Star Wars history, showing just why she scared Emperor Palpatine so much.
Qui-Gon Jinn, who is considered a maverick Jedi Master by his colleagues, might have been able to keep Anakin on the path of the Jedi, had he not been killed by Darth Maul. Star Wars' Qui-Gon Jinn would have been the ideal mentor for the young Anakin.
Because Maul punched him with the hilt of his saber and then stabs him faster than Qui-Gon can pull back his blade. So Qui-Gon lost because Maul was physically stronger and quicker than him. Qui-Gon is skilled but not a prodigy. And he's quickly worn down by Maul in both their encounters.
Though Yoda and Qui-Gon respected each other, they were often at odds due to their differing beliefs; Yoda looked to the future while Qui-Gon lived in the moment.
Qui-Gon Jinn was far from a powerful Jedi Master when it came to fighting. He couldn't even defeat a single Sith Lord's apprentice. He was also the Jedi Master who put too much trust in Anakin Skywalker as his apprentice, which was a proven disaster.
You can also see how much Qui Gon Jinn's death affected Dooku when he was talking to Obi Wan in AOTC. Look at the raw, pure emotion Dooku feels over a decade after Qui-Gon died. It affected him significantly.
Somehow, Obi-Wan or Yoda taught him how to become a Force ghost in time for Luke to see him in Return of the Jedi. Another theory stated that Kylo couldn't become his own Force ghost because he and Rey were part of a Force Dyad, meaning that his consciousness was absorbed into Rey when he died.
The term “gray Jedi” in Star Wars is somewhat of a misnomer, considering that the definition refers to one who is practically non-Jedi. That being said, quite a few Jedi can be placed into this category. But Mace Windu identified as a Jedi despite his possible inclusion in the "gray" category.
