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The Jedi Temple Guards seen in The Clone Wars wield lightsaber pikes with twin yellow blades. These anonymous masked Jedi Knights protected the temple on Coruscant, but we know at least one of their number fell to the Dark Side and became the Grand Inquisitor.
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We first saw the Darksaber in the possession of Pre Vizsla in The Clone Wars season 2 episode The Mandalore Plot, but it later falls into Maul’s hands when he seizes control of the planet in season 5, in the years between Attack of the Clones and Revenge of the Sith. The majority of the Legends colors are just shades of the canon ones, but there are some exceptions.

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Mara Jade was one of the most popular Legends characters, having started out as the Emperor’s Hand, tasked with killing Luke and going on to marry her former target. As an Imperial, she used a magenta blade and would ultimately inherit Anakin’s blue lightsaber after becoming Luke’s ally.

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In reality, actor Samuel L. Jackson asked Lucas if his character could have a purple blade so he’d stand out during the climactic arena battle in Attack of the Clones. Since Windu is “the second baddest Jedi in the universe next to Yoda,” his wish was granted, Jackson revealed in an interview.
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Darth Sidious uses a red blade, which requires that Dark Side users make kyber crystals “bleed.”
Other blue users we’ve seen in canon also include Ben Solo, Kanan Jarrus, Ezra Bridger, Cal Kestis, Shaak Ti, Agen Kolar, Ki-Adi-Mundi, Barriss Offee, Jocasta Nu, Aayla Secura, Plo Koon, Kai Justiss, Sora Bulq and Ferren Barr.

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Blue

Lowbacca, Chewbacca’s nephew who joined Luke’s academy, uses a lightsaber with a bronze blade.

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This blade was blue in the initial edit (and early posters), but it was changed to green so it would stand out against Tatooine’s blue sky in the final cut. The Star Wars YouTube channel’s description for the movie’s teaser trailer, in which the blue blade can be seen, confirms this. 
Lucasfilm/Screenshot by Sean Keane/CNET

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“I knew this lightsaber was the Excalibur of this film,” set decorator Roger Christian told Daniel Wallace for the recently release Star Wars: The Lightsaber Collection. “I knew it would be the iconic image.”
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After obtaining a crystal, dark side Force users must make it “bleed” by channeling their pain and anger into it.

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Ahsoka Tano and her white-bladed lightsabers made their live action debut in The Mandalorian.
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Green

Unusually, most of those we’ve seen wielding the blade (Pre Vizsla, Sabine, Bo-Katan, Gideon and Mando) aren’t Force users.
Villains we’ve seen using red lightsabers include Vader, Sidious, Darth Maul, Count Dooku, Savage Opress, Asajj Ventress, the Imperial Inquisitors and Rey in a vision seen during The Rise of Skywalker. Rey ignites her yellow-bladed lightsaber in the closing moments of The Rise of Skywalker.
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In the third season of Rebels, which takes place between Solo and A New Hope, Sabine Wren obtains the Darksaber and proves herself worthy of wielding it through combat. She ultimately gives the blade to Bo-Katan Kryze, a former lieutenant of Pre Vizsla, who uses it to unite the Mandalorians against the Empire.

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The Legends continuity might not be canon anymore, but we should acknowledge some of the lightsaber colors it gave us.

When Ahsoka makes her triumphant return in Rebels, she uses a pair of lightsabers with white blades. We also saw them in live action for the first time in season 2 of The Mandalorian. 

The color of evil. Those who go down the dark path, mostly notably the Sith, can’t form the same relationship with kyber crystals as Jedi, so they must steal them or take them from slain followers of the light.
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Purple

Rey wields Leia and Anakin’s blue lightsabers to deflect Palpatine’s Force Lightning in The Rise of Skywalker.
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During the production of each movie in George Lucas’ saga, the lightsabers’ blades were actually white. Effects wizards later gave them color using a technique called rotoscoping. And it was concept artist Ralph McQuarrie who decided to associate a blade’s color with a character’s moral standing. So let’s take a look at what the characters’ color choices say about them, and the history of some of their weapons.

Kyle Katarn wields an orange lightsaber in the game Dark Forces 2: Jedi Knight, as do the Mandalorian Knights in Star Wars: Knights of the Old Republic: War comic book miniseries.
Keith Hamshere

Red

Only one person in canon wields a purple blade: the Jedi Council’s Mace Windu.
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Vader’s quest to obtain his crystal and the subsequent bleeding of fallen Jedi Master Kirak Infil’a’s green one, during which he experiences haunting visions, can be seen in Marvel’s 2017 Darth Vader series by Charles Soule.