While many clones followed orders, the clone trooper Slick betrayed the Jedi by leaking intel to the Separatists early in the war, and Tup prematurely triggered his inhibitor chip, killing Jedi Master Tiplar, but the most significant "betrayal" was the systemic turning of the entire clone army by Chancellor Palpatine (Darth Sidious) through Order 66, a secret protocol hidden in their chips, making the clones instruments of the Jedi's destruction.
The entire Grand Army of the Republic has been ordered to hunt down and destroy the Jedi Knights." Aayla Secura was among many Jedi who were betrayed by their clone troopers as a result of Order 66.
Sifo-Dyas was a human male Jedi Master from Minashee who commissioned the Kaminoans' creation of the Grand Army of the Republic over a decade before the Clone Wars.
San Tekka was a member of the Church of the Force and a believer in the ideals of the Jedi Knights. He believed that the Jedi were essential to the balance of the Force and helped the Resistance find the vanished Jedi Master Luke Skywalker, unable to stand idly by as despair and darkness grew in the galaxy.
The clone commando RC-1136, known as Darman Skirata, got Jedi Knight Etain Tur-Mukan pregnant during the Clone Wars, resulting in their son, Venku Skirata, a Force-sensitive child born outside the Jedi Code's restrictions. Their forbidden relationship and child's birth were detailed in the Republic Commando novels, highlighting the complexities of clone troopers' development and the strictures of the Jedi Order, as Etain was killed shortly after Order 66 while protecting her family.
The Lost Twenty, also known as the The Lost, was a name given to the group of twenty Jedi Masters who left the Jedi Order throughout its history. According to Yula Braylon of the Jedi High Council, the Lost Twenty became disillusioned with the Jedi way of life.
Qimir Was Revealed to be The Acolyte's Sith Lord.
No, Darth Plagueis is not Anakin Skywalker's biological father, but there's a strong theory (especially in Star Wars Legends and early drafts) that his experiments with midi-chlorians to create life led the Force itself to create Anakin, the Chosen One, as a reaction, making Plagueis the "unintentional father" of the prophecy. In current canon, Plagueis is a legend Palpatine uses to lure Anakin, and the exact nature of Anakin's conception by the Force remains a mystery, though he had no conventional father.
In doing so, Sifo-Dyas became an unwitting pawn of the Sith, who took over the project and hired the Pyke Syndicate to murder Sifo-Dyas on Oba Diah's moon. A decade after Sifo-Dyas' death, Obi-Wan Kenobi discovered the army he had commissioned, now ready for duty.
In Star Wars lore, Order 37 was a grim Clone Trooper contingency plan to capture a wanted individual (often a Jedi) by taking a civilian population hostage, locking down the area, and threatening mass execution if the target wasn't surrendered, making it a horrific tactic used by the Empire to force Jedi compliance. It was considered more brutal than Order 66 because it targeted civilians directly, forcing Jedi to often turn themselves in to save innocent lives, as seen on planets like Bellassa.
Since he removed his control implant, Wolffe was no longer able to be forced into complying with Order 66.
Famously, Shaak Ti has died more times than almost any other Jedi in the EU.
Sabine's desire to find Ezra and the potential Master-Padawan bond between them may have influenced her decision to betray Ahsoka and prioritize finding Ezra over destroying the map to Thrawn.
Baylan and Shin Hati are Dark Jedi, not Sith, as they adhere to certain practices of the fallen Jedi Order despite using the dark side. Baylan and Shin have visual parallels to Darth Vader and Darth Maul but are unique dark-side villains with their orange-red lightsabers.
During the High Republic Era, Plagueis was actively working against the Jedi. By 132 BBY, he had taken on a former Jedi—a human known as "the Stranger" or by the pseudonym "Qimir"—as his apprentice.
Darth Maul was stronger than Obi Wan, he proved that when he killed Qui-Gon but he was over primed and traded being a showman for his life. Another contender for the weakest Sith could be Count Dooku, or has he's also known Darth Tyranus.
Plagueis was fully aware Sidious was training Maul as a Sith assassin. Plagueis knew about Maul, Maul suspected Sidious had another master but didn't know for sure. Plagueis had actually intended to end the rule of two with himself and bring back the Sith numbers so he encouraged Sidious.
Master Dooku and Master Sifo-Dyas. After the battles of Galidraan and Baltizaar, Dooku became increasingly withdrawn from the Jedi Order. He refused to accept any more missions from the Jedi Council and became concerned about prophecies he felt were coming true about dark times unfolding across the galaxy.
I genuinely believe ahsoka was one of yoda's favourite Jedi ever!!!