Obi-Wan couldn't save Anakin because Anakin had fully embraced the Dark Side, becoming Vader, and Obi-Wan's mission became to stop him, not rescue him; his deep brotherly bond made him hesitate to deliver the killing blow after disarming him, leading him to leave Anakin to his gruesome fate on Mustafar, believing him mortally wounded and beyond saving, a decision driven by duty, emotional conflict, and the overwhelming power of the Dark Side that had consumed his former apprentice.
Obi-Wan only believed Anakin could be saved when Luke did on Endor. So, at that moment on Mustafar, Obi-Wan should have finished Anakin, but he didn't have the courage to do it because ironically he had an attachment to Anakin.
In canon it was Kirak Infil'a , Cere Junda, Obi-Wan and Lord Momin . All messed him up quite badly with Kirak winning round 1 but losing round 2 and Momin cutting off his arm. Obi-Wan actually beat Vader. In Legends it was Shaa Koon, An'ya Kuro, a clone of Maul and Galen Marek.
Most believe it was mercy, but the truth cuts deeper. Obi-Wan had already accepted that Anakin was gone. The boy he trained, the brother he laughed with, the friend he loved—no longer existed. That duel wasn't simply light versus dark.
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.
"Not from a Jedi." Sidious remembered Plagueis as a powerful Sith who discovered the ability to achieve immortality.
The saddest Star Wars deaths often involve poignant sacrifice, broken relationships, or innocent lives lost, with fan favorites including Kanan Jarrus (heroic sacrifice for his family), Duchess Satine (Obi-Wan's lost love, brutally killed by Maul), Clone Trooper 99 (innocent loyalty and tragic end), Tech (sacrifice for his squad), Padmé Amidala (heartbreak and loss of hope), and Han Solo (fatherly tragedy). These deaths resonate due to their emotional impact, the characters' potential, or the deep impact on other heroes.
Arguments might be made that he suffers from dysthymic disorder (mild but persistent and intrusive depression) because he does not openly demonstrate his suffering at the story's beginning, or posttraumatic stress disorder because these problems follow the traumatic events of Star Wars Episode III: Revenge of the Sith.
It kicks off right after the end scene of ROTS and shows Vader beginning his hunt for Jedi in his new body. His very first target is a Jedi Kirak Infil'a, a Jedi who lived for combat who nearly kills Vader.
Vader breaks free of the operating table and takes a few steps before doing the only thing anybody in his position could do, he screams an unholy, bloodcurdling scream. His vocal computer has nothing close to this sound in its database so it translates it to the infamous 'Noooooooooo'.
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.
Day one of meeting Anakin they are breaking thousand year traditions to accept a very clearly not suitable kid into his order. Then Anakin spends the rest of his Jedi years being an arrogant rule breaker. Then Anakin cut off his hand and killed him. Mace Windu had plenty of normal reasons to not like Anakin.
In that final battle, when Vader said, “You didn't kill Anakin Skywalker. I did,” Obi-Wan finally let go of the guilt he had carried for so long. He saw that Anakin's fall wasn't his responsibility. It was Anakin's choice.
In a study published in the journal Psychiatry Research, French psychologists and psychiatrists determined that Darth Vader had six of the nine criteria used for a BPD diagnosis, as defined by the Diagnostic and Statistical Manual of Mental Disorders (DSM): Impulsivity. Rage and anger management issues.
Even when she first met Darth Vader, Leia was not particularly aware of her connection to the Force. Leia grew up as a princess on Alderaan and later became a senator on Coruscant. Her adoptive father, Bail Organa, did everything in his power to protect Leia's true identity from being discovered.
Revenge of the Sith
Palpatine explains that Plagueis was so powerful and wise, he had mastered the dark side of the Force to such an extent that he could cheat death (mostly saving people he cared about from death) and create life; unnatural abilities which are unknown to the Jedi.
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.