Dr Pepper
Registered User
I saw JK Simmons on an episode of Celebrity Poker and he could not have been a nicer / funnier guy. He was laughing talking about his character in Oz (the Celebrity Poker episode was before he became more of a mainstream star) and how people find him so intimidating when they meet him in real life. He said its funny because it couldn't be farther from the truth that he is a total wimp in real life. He was pretty funny.
Also, a short lived character I liked on the show was the Ukranian Hitman, Yuri Kosygin. That guy was scary as Hell. probably the most intimidating character ever on the show, even more so then Adebisi & Schillinger.
The calm way he went about killing people....yeah I'd say he was definitely one of the more cold-blooded characters on the show.
And while they were most often used for comedic purposes as a duo, Rebadow and Busmalis both had a sinister side as well (escape tunnel cave-in).