Who do you consider to be the biggest villan / the Main big bad of Star Wars Legends universe? For me that is still Palpatine but in the EU there are multiple
Star Wars: Princess Leia Challenged Emperor Palpatine to Lightsaber Combat While She Was Pregnant
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Palpatine, Disney Wiki
In Star Wars, what movie does the Emperor first appear in? - Quora
Emperor Palpatine Retcon Revealed Following Star Wars: The Rise of Skywalker's Box Office Disappointment - Bounding Into Comics
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Star Wars: Did Palpatine Want to Die in Return of the Jedi?
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This Rise of Skywalker theory explains Palpatine/'dark Rey' link
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Emperor Palpatine Star wars bad guys, Star wars cartoon, Dark side star wars