Nephthys
Yes. He can open wormholes and teleport himself around despite never doing that once.
Not true:
Star Wars: Gamer #5
The moment the Emperor "died" at the Battle of Endor, Droga fell into an inexplicable insanity, butchering his crew and causing the Emperor's Shadow to plunge into Kaal's oceans. Even as he perished, Palpatine used the dark side knowledge the Sith Lords had granted him years earlier to rend space itself and transmigrate his essence across lightyears to Droga's body. The infusion of Palpatine's overwhelming dark side energies reduced Droga to incoherent madness. Eventually, Palpatine's Grand Vizier Pestage was able to find Droga and tear the Emperor's essence from Droga's body.
He actually did do it, once. I'm pretty sure this excerpt has already been posted and you don't strike me as a dishonest person, so I'm sure it just slipped your mind.
Thank goodness I was here to remind you.