Canon & Legends-
Genius who rose to power despite his alien blood to become one of the most feared and respected leaders and military minds in SW lore...fucked with force users, including Vader, all with no Force ability at all.
Legends - fortified the Unknown Region with little support to defend the Galaxy against extragalactic threats. Returned 5 years after Endor when the Empire was at 1/4 of their strength, turned shit around, brought the Republic to it's knees before his untimely death. Decades later, the possibility of his survival scared the shit out the NR and united the last of the die hard Imperial loyalist for one more push against the NR.
Roll Sun Tzu, Sherlock Holmes, Rommel, Alexander the Great and Napoleon into a Star Wars villain....
GOAT