Vader's son, Luke Skywalker, learned Form V in part by mirroring the swordplay of his father in their first duel, and the younger Skywalker ultimately defeated his father with his use of Form V during their second duel.
Marek's lightsaber-training holodroid, PROXY, replicated Soresu with his Obi-Wan Kenobi combat module, doing so with such accuracy that Marek used it as reference when he studied the form. Luke Skywalker had some skill in Form III, using it to deflect blaster bolts.
Jedi Battlemaster Cin Drallig and Grand Master Yoda had knowledge and mastery of all seven forms, including Juyo, befitting Drallig's role as lightsaber combat instructor at the Jedi Temple and Yoda's reputation of having mastered all forms of lightsaber combat as did Anoon Bondara, another lightsaber instructor.
Form V, also known by its two primary disciplines of Shien and Djem So, was the fifth form of lightsaber combat used by members of the Jedi Order.
Luke Skywalker's lightsaber was changed from blue to green when they were filming because it was difficult to see. This became apparent during act one of Return of the Jedi when the battle on Jabba the Hutt's sail barge was shot during the day. The blue lightsaber blended in with the clear blue sky.
It's possible that Rey adopted the yellow-bladed lightsaber (or perhaps the kyber crystal conjured a yellow blade based on the changes within its wielder) in honor of those emotionally detached sentinels tasked with guarding the Jedi Order.
After Yoda's death in 4 ABY, the lightsaber with its accompanying storage box ended up in the possession of Yoda's last Jedi apprentice, Luke Skywalker. In 9 ABY, Skywalker offered the saber to Grogu, a young member of Yoda's species; who was being trained by Skywalker at his Jedi academy on the Outer Rim planet Ossus.
Sokan was a form of lightsaber combat. Developed by the ancient Jedi Knights during the Great Sith War, Sokan combined tactics that allowed for evasion and mobility with the kinetic motions of Form V combat.
It could be used to combine double-bladed lightsaber combat with other Force abilities, like pushes and lifts. Darth Maul had mastered this form and employed it in his duel against Obi-Wan Kenobi in the Theed power generator.
Notable practitioners
Other than Lucien Draay, Meetra Surik, Obi-Wan Kenobi, and Kit Fisto, Shii-Cho had many advanced and/or specialist practitioners. In more recent years, the form was mastered by the Jedi swordmaster Cin Drallig along with the other six forms.
The oldest of the seven lightsaber forms, as well as the most basic, is Shii-Cho form, otherwise known as The Way of the Sarlacc and The Determination Form. Shii-Cho is traditionally the first lightsaber form taught to Jedi initiates.
While there are many one-of-a-kind lightsabers in the Star Wars universe, there is only one with the history and legend of the Darksaber, which was created by the first Mandalorian Jedi named Tarre Vizsla.
After turning to the dark side and joining the Sith, Vader continued to employ Form V. His secret apprentice, Galen Marek, was also familiar with the form, having been personally trained in its usage by Vader.
Kylo Ren's Lightsaber Form
The evidence isn't entirely clear, but it is most likely that he was an adherent of Form V, particularly the Djem So variant. Ren's fierce fighting style has the hallmarks of Djem So, which demands a high degree of speed and strength to execute a flurry of attacks and counterattacks.
Notable users of this combat form during the Old Republic included Yoda and Qui-Gon Jinn. The New Jedi Order preserved knowledge of Ataru, and Jedi Masters such as Luke Skywalker, Mara Jade Skywalker, and Kyle Katarn all employed it.
Form V was the style of choice for Anakin Skywalker, who continued to use the form after becoming the Sith Lord Darth Vader. Luke Skywalker became one of the galaxy's most skilled practitioners of Form V, as shown in Return of the Jedi and various Legends-era non-movie material.
There are 7 forms of lightsaber combat, but Soreso, Shein, and Vaapad are the most effective. Soreso, Vaapad, Shein, are the most effective forms because they are all strategic and have their strengths and weaknesses. But the thing they all have in is that you must fully commit to the form.
Mace specialized in the seventh form of lightsaber combat, AKA Juyo or Vaapad. Windu was the only known practitioner of this form that didn't fall to the Dark Side, mainly because the style calls for an aggressive, unpredictable approach (much like Maul's, just less jumping around).
In the Star Wars Legends continuity, the founders of the Jedi Order were Jedi Masters Cala Brin, Garon Jard, Rajivari, and Ters Sendon.
Vader's new hybridized of Djem So consist elements from all seven lightsaber forms, which Vader became a master of each form. In his final duel with Obi-Wan, Vader's mastery in Form III was so perfect that Obi-Wan was unable to find an opening for an attack.
Yoda. Yoda was a wise, experienced, and powerful Grand Master of the Jedi of an unknown species and the oldest known prophet in existence (having lived at least 900 years), considered the wisest and most powerful Jedi Master within the Star Wars universe.
In truth, the Sith normally wielded enough powers to fight without a lightsaber, but every apprentice still learned to use one as part of his or her training. Sidious himself felt that he and his peers had outgrown the use of lightsabers, and only continued carrying them to mock the Jedi.
Encased in a distinctive silver-and-copper hilt, Leia's lightsaber used a naturally-occurring blue kyber crystal, much like Luke's original saber that he had inherited from his father by way of Obi-Wan Kenobi.
Oddly, yes. A 2016 book called Star Wars: The Complete Locations claimed Yoda had his lightsaber stored in his hut on Dagobah. Meanwhile, a 2017 Darth Vader comic depicted Palpatine publicly burning Yoda's lightsaber publicly as a propaganda stunt.