Some Jedi are explicitly shown using red lightsabers in Legends, however. This includes Adi Gallia, Even Piell, Depa Billaba, A'Sharad Hett, and even Luke Skywalker.
Gallia wielded her red-bladed lightsaber on Yitheeth while on a mission with Eeth Koth: the Jedi stopped the criminal Olmar Grahrk, who was trying to start a war between the Yinchorri and the Galactic Republic.
Yes, you can get a red lightsaber in Star Wars Jedi: Survivor. The red lightsaber color is available once you complete the main campaign. Once you beat the final boss, you will be notified that a suite of unlocks have been made available, chief among them is a new red lightsaber color.
There's no reason a Jedi couldn't use one. However, since red was associated with the Sith (they had to use synthetic crystals since they didn't have access to Illum where most of the natural kyber deposits were located), they generally chose not to.
Anakin's Fourth Lightsaber (Red)
This is the lightsaber that Anakin wielded in the Duel on Malachor against Ahsoka Tano, Ezra Bridger, and Kanan Jarrus; the Duel on the Death Star against Obi-Wan Kenobi; and the Duel on Cloud City against Luke Skywalker.
He tracked Jedi Master Kirak Infil'a to the river moon of Al'doleem and confronted him. Vader eventually killed the Jedi Master and retrieved his curved-hilt lightsaber. He headed to Mustafar, where he bled the lightsaber's crystal, turning it from green to red.
Affiliation. This blue-bladed lightsaber belonged to the Sith Master Darth Sidious after his resurrection on Byss. Darth Sidious using the lightsaber to battle Luke Skywalker. In his lab on the Imperial throne-world, Darth Sidious kept a number of stolen Jedi lightsabers if he needed them.
Relatively recently, Star Wars canon established that the reason a red lightsaber is red is because the crystal bleeds after the user does something really, really bad. Meaning, your lightsaber can change colors, and Rey's has changed colors because she's done something bad enough to cause the crystal to bleed.
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.
Use by Jedi
Force lightning ability was not restricted to dark-siders. Jedi and other light-siders who were strong of will and character could learn this power without falling to the dark side—but its use was viewed as inherently corrupting, and most Jedi Councils forbade its use.
Kyber crystals are rare gems that possess a natural connection to the force. Kyber crystals have to be mined from deep within the ground, and so they are only found on specific worlds like Ilum, Exegol, Jedha, Lothal, and Utapau among others.
Bleeding was the process that a dark side adept used by way of the dark side of the Force to bend a kyber crystal to their will, turning it red. It was possible for some light side users to purify corrupted crystals, which would bring them back to the light side and change their color.
The Sith apprentice Darth Maul wielded a double-bladed lightsaber made by joining two hilts together end-to-end. Maul's dexterity and extensive training allowed him to use his weapon as a single-bladed saber, or to activate both crimson blades and fight multiple opponents at once.
Ahsoka Tano, the former Jedi Padawan who aided in the rebellion against the Galactic Empire, is acknowledged as the sole possessor of the white lightsaber.
Darth Sidious is regarded as one of the all-time most powerful force-attuned individuals. Palpatine's red lightsaber is first revealed when four Jedi masters attempt to arrest him in the chancellor's office.
Rey's lightsaber was a yellow-bladed lightsaber that was constructed by the Jedi Rey Skywalker following the First Order-Resistance War.
Originally the weapon had a blue blade, but after his destruction of the Jedi Temple and fall to the dark side in 28 ABY, Ren modified it into one with a red blade.
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.
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.
Darth Sidious was also one of the greatest and most skilled Sith swordmasters, as he has mastered all the seven lightsaber forms, all their stances and techniques and is capable of using each form equally effective ambidextrously.
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.
Red lightsabers are the weakest, according to a Star Wars study conducted at the University of Leicester regarding lightsaber colors. Decades of Star Wars lore has dictated that the red lightsabers favored by The Sith offered greater offensive capabilities than the softer colors favored by The Jedi.
Black lightsabers are extremely rare in the Star Wars universe, and only a few have been seen on screen. These lightsabers are typically associated with the Dark Side of the Force and wielded by Sith or Dark Jedi. The most well-known black lightsaber is the Darksaber, which was created by the first Mandalorian Jedi.
The former Sith used the Darksaber for his own dark purposes, including killing one of the people who meant the most to Obi-Wan Kenobi.