Green lightsabers have been wielded by a number of famous Jedi including
After losing his father's lightsaber on Cloud City, Luke Skywalker constructed a replacement with a green plasma blade, its hilt similar to that of Obi-Wan Kenobi's weapon.
After losing his hand, Luke's lightsaber was replaced by his green one in Star Wars: Return of the Jedi. Chronologically, Luke appears next in The Mandalorian with his green lightsaber, and then later confronting a young Ben Solo with it during a flashback during Star Wars: The Last Jedi.
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.
Anakin Skywalker carried this blue-bladed Jedi weapon throughout the Clone Wars. After dueling his former apprentice on Mustafar, Obi-Wan Kenobi took Anakin's lightsaber and kept it on Tatooine for nearly two decades.
The Jedi Padawan Jolee Bindo fought for the Galactic Republic in the Great Sith War against the Sith Lord Exar Kun, who sought to establish a new Golden Age of the Sith. After the war ended in 3996 BBY, Bindo abandoned the Jedi Order and became a Gray Jedi.
Rey's lightsaber was a yellow-bladed lightsaber that was constructed as a personal weapon by the Jedi Rey Skywalker following the First Order-Resistance War.
Leia Organa's lightsaber was a blue-bladed lightsaber powered by a kyber crystal in the core of the hilt. It was silver and copper in color and featured mother-of-pearl inlays. Organa's weapon was considered a work of art, having an elegant symmetry with silver and gold hues that evoke to her upbringing on Alderaan.
It's because of his mastery of sorsue (sorry for my bad spelling.) Well if you want the ACTUAL reason it because in the original 3 films the Green Light Sabre didn't exist until after Obi Wans death.
After pledging himself to the Sith Lord Darth Sidious, Anakin Skywalker took the name Darth Vader but continued to use the blue-bladed lightsaber he'd fought with during the Clone Wars.
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.
Green lightsabers are typically used by Jedi who has strong abilities with the force. Telekinetic abilities, such as moving large objects, and mind tricks are just some of the useful tools in these Jedi's repertoire. Jedi Consulars were most well known for their alignment with green lightsabers.
Built to replace his father's lightsaber, Luke Skywalker's own lightsaber contained a kyber crystal and emitted a green plasma blade. Its hilt was similar to that of Obi-Wan Kenobi's third lightsaber, as Skywalker modeled his weapon on his late Jedi Master's lightsaber, but simplified some of the design elements.
The purple color itself is considered the most powerful lightsaber color in the Star Wars galaxy. A very few Jedis ever wielded a lightsaber of this color. The only two known people to ever wield a purple color lightsaber are Mace Windu and Darth Revan from the past.
Green indicated a Jedi Consular, a Jedi who preferred to reflect on the mysteries of the Force and fight the dark side at its heart. Yellow indicated a Jedi Sentinel, a Jedi who honed his or her skills in a balance of combat and scholarly pursuits.
Yoda's lightsaber was smaller than a standard Jedi lightsaber, befitting his shorter stature. But its green plasma blade was every bit as deadly in combat.
After he lost his second lightsaber prior to the First Battle of Geonosis, Jedi Obi-Wan Kenobi, who was promoted to the title of Jedi Master as well, built a new lightsaber for himself during the ensuing Clone Wars between the Galactic Republic and Confederacy of Independent Systems.
The Boba Fett lightsaber is a single-bladed green lightsaber that he uses in combat. The saber was made famous by its visible, constant glow in media concerning the popular character.
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.
In the final moments of The Rise of Skywalker, Rey ignites her new lightsaber and reveals its yellow blade. We don't know where she got that kyber crystal, but her color choice lines up with her being the new guardian of the Jedi traditions.
She carried the weapon during the Battle of Rendili, but it didn't taste first blood until she engaged in a lightsaber duel shortly after the battle with Asajj Ventress. After the duel, in which Padmé was victorious, the weapon was wielded by Skywalker for the rest of the Clone Wars.
The Forbidden Forms were forms of lightsaber combat used by the Sith during the Sith Wars. According to the testimonies of the Jedi Cervil the Uncanny, lightwhips—a lightsaber variant with a flexible blade—were used to defend against Sith Lords who utilized the forms.
Lightsabers with ghostfire crystal cores also generated almost no sound and produced illusory afterimages of the blade that followed the motions of the wielder, the most curious effect of all which disguised the true position of the blade while also disorienting foes.