Doctor Jonathan Micheael "J.D." Dorian is the main character and narrator of Scrubs and is played by Zach Braff.  J.D. is best friends with Turk, who he's been friends with since they were roommates in college.  J.D. quickly meets Elliot, who he falls for hard and has an on and off again relationship with throughout the series. 

J.D.'s mentor is Dr. Cox who he is constantly trying to impress without making much headway.  He also has a bitter rival at Sacred Heart who torments him endlessly... The Janitor.  J.D. frequently daydreams where he tilts his head to the side and drifts away.

J.D. Quotes

J.D.: Hey, I heard a great joke. A guy walks into a dentist's office and says, "I think I'm a moth." And the dentist says, "Well, if you think you're a moth, why are you at a dentist's office?"
J.D.'s narration: Oh, no, I forgot the punchline... You can't bail out now! Stall! Stall!
J.D.: ...So the moth says "That's a good question. What kind of dentist are you?" And the dentist says, "Well, I'm a general dentist, but I...I do dabble in orthodontry - braces and such." And... and the moth says, "Orthodontry? I hear there's great money in that."
J.D.'s narration: "The light was on"!
J.D.: "But! To answer your original question, which was, if I think I'm a moth, why am I in a dentist's office? The answer is, Because the light was on!" The light! The light, James. Moths love light. So, James, other than your funny bone being broken, what seems to be the problem?

Turk: Dude, I'm dying here.
J.D.: Turk, it's been like eighteen hours since you had sex.
Turk: I'm saying, this is torture!
J.D.: So why don't you just, like, "take care of yo'self"?
Turk: Man, you know I don't do that.
J.D.: You don't?
Turk: Nah, I've only done that like twice in my life.
J.D.: Same here.
J.D.'s Narration: If by "in my life" you mean "since I came home."

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Scrubs Quotes

Turk: Sorry, dude. Where were you?
J.D.: I was treed by that coyote!
Turk: You got your phone?
J.D.: He took it.

(To Dr. Cox) Want me to bury you?

J.D.