Kill Wombosi? We can do that any time we want. I can send Nikki to do that, for Chrissakes. Mr. Wombosi was supposed to be dead three weeks ago. He was supposed to have died in a way where the only possible explanation was that he'd been murdered by a member of his own entourage. I don't send you to kill. I send you to be invisible. I send you because you don't exist.
— Conklin, The Bourne Identity
And like that, he's gone. Underground. Nobody's ever seen him since. He becomes a myth, a spook story that criminals tell their kids at night. "Rat on your pop and Keyser Söze will get you." But no one ever really believes... Keaton always said, "I don't believe in God, but I'm afraid of him." Well, I believe in God — and the only thing that scares me is Keyser Söze.
— Verbal Kint, The Usual Suspects
Spiros: He knows my name, but my name is not my name. And to them, you are only "the Greek".
The Greek: And, of course...I'm not even Greek.
— The Wire
What can we do, Barnes? Put a guy at the airport? How many identities do you think Hunt has? How many times has he slipped past customs and in how many countries? These guys are trained to be ghosts. We taught them to do it, for Christ's sake!
— Eugene Kittridge, Mission: Impossible
Instead of being known by any particular name or costumey gimmick, you can simply be the mysterious 'thing' that no one ever sees but knows truly exists. The nightmarish monstrosity only hinted in rumors and whispered in folktales, existing out there somewhere, ready to eat them should they get to close. The fact that no one ever sees you will only add to the legend, making you even more terrible and fierce. People fear what they do not know, and even if you do not really exist, you will still be very fearsome indeed.
— So You've Decided To Be Evil by Neil Zawacki.