The Jedi & the Sith have historically belonged to the good side and bad side of the Force respectively, both of which are opposition to one another. The Jedi normally wield a blue or green lightsaber, while the Sith are frequently identified by their terrifying red lightsabers.
Can you have a red lightsaber without being a Sith?
Rather than being found naturally on worlds such as Illum or Christophsis, red kyber has to be made by the Sith. After procuring natural kyber (no matter the color), a Sith Lord corrupts the crystal using the dark side of the Force in a process known as "bleeding".
In both canon and Legends, Jedi will sometimes use red-bladed lightsabers in emergencies where they're missing their lightsabers and a Sith weapon is the only one available.
Yes. There is no inherent aspect of a red lightsaber that makes it unusuable for a Jedi. Just as a Sith could use a lightsaber of any other colour. The colour is just a signifier of your 'side' your alleigance.
Traditionally, yellow lightsabers are associated with Jedi Sentinels, who balance their combat skills with a strong focus on exploration and practical application of the Force. This choice reflects Rey's well-rounded training and her determination to maintain balance in the Force.
Construction. In the construction of a Sith lightsaber, individuals partook in a process known as bleeding. By ways of the Force, they would pour negative emotions, such as rage, hate, fear, and pain into kyber crystals. The process would result in the crystals gaining a distinctive crimson or red hue.
During his brief apprenticeship under the reborn Palpatine, Luke was forced to replace his green crystal with a red Sith gem. He ultimately wielded this red blade in rebellion against Palpatine, who had a blue-bladed lightsaber and overcame the Sith Lord.
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.
The black lightsaber, or Darksaber to give it its proper name, is one of the rarest lightsabers in Star Wars canon. Despite its rarity in canon, anyone who has seen the second season of The Mandalorian is likely to be familiar with the Darksaber.
The Darksaber. The only black blade-like Saber ever made, constructed with fine Beskar, by the only Mandalorian to ever become a Jedi in the Order's entire history.
After his reincarnation, Darth Sidious aka Palpatine used a blue-bladed lightsaber when he fought Luke onboard his Super Star Destroyer Eclipse. Ultimately, Sith who wielded colors other than red were usually looking to disguise their dark affiliations.
The crossguard blades allow Ren's saber to operate safely – his weapon is constructed around a dangerously flawed kyber crystal, which would be overloaded if not for the lateral plasma vents that create the quillons.
Pink sabers, also known as magenta sabers, are indeed a part of the Star Wars canon. They are quite rare and symbolize compassion, empathy, and great control with manipulation. Cal Kestis, a character from the Star Wars Jedi: Fallen Order game, has the option to wield a pink or magenta saber.
Out of all the kyber crystals, the Kathracite, with its light green colour, is known for being the weakest. Its blades are less powerful and not as strong as others. Despite being weak, Kathracite crystals were important in the Jedi Order.
However, a groundbreaking study conducted at the University of Leicester's Centre for Interdisciplinary Science challenges these long-held assumptions. The study suggests that, against all expectations, red lightsabers may actually be the weakest of the lot.
The issue ends with Luke Skywalker taking his High Republic lightsaber, his new green Kyber crystal, AND the red Sith Kyber crystal with him as he leaves Dr. Cuata.
After destroying the Jedi Temple in 28 ABY, Ren used the dark side of the Force to bleed his lightsaber's kyber crystal, changing the color of its plasma blade from blue to red.
The blue lightsaber has what you might call the "classic" sound of a lightsaber, while the red one has a bit of a lower pitch to it (probably to denote the bad guys' lower morals). The yellow lightsaber, meanwhile, has an almost tranquil quality to it, sounding a lot less rougher than the other blades.
