Rodrigo Istalindir
Explorer
Tarkin. For one thing, Grievous and Jabba don't really stand on thier own. A lot of their coolness and mystique comes from other sources. Grievous' backstory in the EU obviously adds to the character. And Jabba, while only on-screen in Jedi (Episode IV revised notwithstanding), played a significant role behind the scenes in all three original movies. Tarkin, however, stands alone.
Plus, he treated Vader like his lapdog, bluffed Princess Leia, and blew up an entire planet just to make a point.
Plus, he treated Vader like his lapdog, bluffed Princess Leia, and blew up an entire planet just to make a point.