A veteran gangster and a long-time friend of Joe Cabot, he is one of the six men assembled by the latter for the jewel heist. He is good-natured and persuasive, and believes in a code of honor among criminals.
Pragmatic Villainy: Just because he hates killing civilians doesn't mean he won't kill cops.
Rated M for Manly: "Shit, you shoot me in a dream and you better wake up and apologize" and other general badassery. Makes his extremely unmanly, undignified sobbing at the end of the movie all the more jarring.
Too Dumb to Live: He distrusts people he had known for years while betting his life for a guy he only knew for a few days.
Happy Dance: a very dark and twisted version of the trope.
It's All About Me: It doesn't matter to him who he works for, because he doesn't like to be told that he has a boss.
Moral Sociopathy: He'll torture and murder innocent people, but, he refuses to give info to the authorities on his boss.
The Only One I Trust: both Mr Pink and Joe Cabot single him out as being most definitely not an undercover cop, albeit for different reasons (Pink because Blonde's too psycho, Joe because Blonde has previously demonstrated his Undying Loyalty).
The Sociopath: He's the least sympathetic member of the gang for this reason.
Softspoken Sadist: He never raises his voice even where he's describing to the cop about how much he'll enjoy torturing him, or justifying killing a crowd of people in a store because the alarm went off.
Politically Incorrect Villain: Averted. If you listen, he is the only character who doesn't spew racist, misogynist, or homophobic dialogue, which leads to a Fridge Brilliance moment when you realize he is a cop with a African-American chief, whom he seems to respect, and is probably a nice guy in real life.
Too Dumb to Live: He could have justified himself about shooting Blonde simply saying he was about to burn Marvin Nash to Death and stop, instead of adding the story of Blonde's supposed planned betrayal. Not to mention the fact he confess to be a cop to Mr White simply because he saved his own life.
Nah, just planning on killing Marvin Nash wouldn't have been a good enough reason for Orange to kill Blonde, though. Orange probably did the only thing he could in that situation, considering he had no reason to think Blonde and Eddie were best friends since all the rest were strangers. As for confessing to White, that was a matter of honor, Orange probably knew it was over for him after the second bullet.