Shaco.
Hands down. His laugh is creepy...

for me it was
lux and yi

AP Teemo....still stomps noobs :P

rengar can 100 to 0 most champs so, id imagine him, he just 1v1'd me even though i had over 250 armor :B

I'm not kidding when I say that in one game when I was a noob there was an absolutely terrifying Eve, back when she was really bad. But this guy knew how to use her, and we were too noob to know how to counter her. It was bad.

nocturne scares me irl

Master Yi, Tryndamere, and Annivia for me. master yi for obvious reasons, tryndamere for his ulti, and for maybe a week straight i could not figure out why annivia was turning into an egg when i killed her, nor did anybody tell me it's her passive.

Back when I played in the beta Jax was the scary beast, jumping everywhere and being able to 1v1 any hero that were (at that point) in the game. Now id say Lee Sin can be pretty scary for less experienced players because of how much he can jump around and be on your face so quickly!

Oh jeez, me and my friends all started playing at the same time and we were afraid of almost all of the same people. I think they were: Tryndamere, Sion, Olaf, Dr. Mundo, Fiora, Kennen, Pantheon, Rammus, Shaco and Warwick. We thought they were op but now that we have experience we realized that there are ways to beat them easily.