He believes that the original park creator, Arnold, hid some mystery in the park before he died 34 years earlier, and is focused on finding out what this secret is. Man in Black is a Westworld veteran who has been visiting the park for over 30 years. The Man in Black is a main character in HBO's Westworld, played by Jimmi Simpson and Ed Harris. –The Man in Black to Juliet about his dark side and her suspicions that he doesn't love her back, in ' Vanishing Point'

But you saw right through it, didn't you? You're the only one. at least in this world, it has to count for something, right? I built a wall, and tried to protect you, and Emily. I tried to do great, I was faithful, generous, kind.

It was mine all along, and I decided how much of it I let into the world. And I could see nothing else, until finally I understood that the darkness wasn't something marred from something I've done some incredible decision I've made - I was shedding my skin. And then one day, it was there - a stain I had never noticed before a tiny flicker of darkness, invisible to everyone.

Rimworld man in black