The Emperor's force-using secret agent- one of several- they are called "Hands". Tries to kill Luke as revenge for the Emperor's death but fails. Eventually they fall in love and get married.
Why can I only cast the baddies? Michelle Forbes as Ysanne Isard (That one would actually scare the hell out of me) Christoph Waltz as Grand Admiral Thrawn Sam Neill as Admiral Pellaeon.