Imagine, for instance, a creature with visual omnipresence. Omnipresence means that you can exist everywhere at once, able to see and witness everyone and everything. Unlike an omnipotent character, who knows everything, an omnipresent character would be able to see everything themselves. It'd be impossible to keep any secrets from this godlike ability, because everywhere you go, whether sleeping or awake, the character's there, watching. Imagine for example, Sauron with visual omnipresence- he takes one look at the Ring- book's over in chapter one. Same thing with Voldemort, President Snow, Darth Vader- you get the idea. Even in history this idea is terrifying. Want D-Day or the next drone strike to be a secret? What if the villain sees everything all the time? In nearly all fiction, the protagonists do things the villains aren't aware of. Crafting a story around this feat is daunting.
Let's make this supervillain more three-dimensional. As of now, he just has a superpower, albeit an impressive one. Imagine the villain also has a supernatural means of transportation. While he's still able to see everything anywhere, he can't actually get to places without traveling. We won't let him fly directly, that's too Marvel Universe for us, so instead we give him a flying car. Yes, he can hop on a flying car and travel rapidly to any location in the world. How fast? Let's assume he can get anywhere he wants within a single night, even making multiple stops. Scared yet? This character can see everything, and now get anywhere within one night. It's like having a TARDIS with the viewfinder always switched on.
The guy's still not interesting enough, though. Let's give him some minions. All villains have them. This character's got dozens of them- all enslaved to his will. They do whatever he says all year round, making anything he asks for. Yeah, now we're cooking, a character with visual omnipresence, able to travel anywhere within a night, who has a horde of servants.
Now we need to stop focusing on the evil/supernatural aspects and give our character some personality. President Snow and his blood breath and love of roses, Darth Vader's persistent asthma and respirator- that sort of thing. Hmmm... well, let's start by making the character fat. Too many villains are really thin and gaunt. It seems the skeletal look usually frightens people, so let's make our character as chubby as possible. In fact, give him nice red cheeks, almost comical looking.
Let's also give him a backstory. Maybe he used to be a farmer. Yes, he was a farmer long ago, before things went terribly wrong. His mother used to say "Plant, plant, plant! Plough, plough plough!" He's never forgotten the last thing his mother demanded, asking him to hoe the fields, right before the accident. To this day, the guilt around her final words consumes him, and he can't stop repeating them.
This character, by now, should be truly terrifying. Let's take a look at what he might look like, if an artist was to draw a rendition:
Click HERE to see an artist rendition.
And no, I won't even get into the obsession with little kids. That's too frightening, even for me. :-)