My fav villain is Darth Maul, because in TCW he's so hateable, with all of the murders and backstabbing he does, Then in The Lawless, he
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is in a curbstomp battle against Palpatine, who plays around with him and ultimately leaves him alive, but the one person he loved (his brother Savage) dead
And later on in the comics, his mother and mentor figure dies as well. So you hate him for all of the undoubtibly terrible things he's done in TCW and as
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head of Crimson Dawn
, but you feel a bit bad for him in general, especially when we see in Rebels that he's been reduced to a nutty old man wandering the sith temple, desperate once again to end Obi-Wan. He finds Obi-Wan eventually, and Obi-Wan kills him with one quick slash of his lightsaber, and Maul dies in his arms.
Another good villain is Queen Levana from The Lunar Chronicles. While she isn't really developed in the books, her prequel novella Fairestdoes make you feel a bit sorry for her, her actions against Evret
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who she forced into marrying her against her will, glamoured herself as his dead wife, and used her gift to manipulate him into having sex with her
and later the Rampion crew cancel those out.
I also enjoy characters who aren't clear-cut heroes or villains, like Hondo Ohnaka. In TCW, he was just as likely to have an episode devoted to him causing trouble than to him aiding the Jedi, sometimes even during the same story arc. His flamboyant and fun-loving yet unquestionably bad*** personality help, along with his one-liners.
Beckett is another good one, because while he isn't a villain, per say, he does….give Han a reason to shoot first. But he was a cynical thief played by Woody Harrelson in what was essentially the role of "Space Haymitch".