Deadpan Snarker/Playing With

Basic Trope: A character given to wry, sarcastic, or excessively dry humor, usually in the form of snide commentary or an occasional aside.
 * Straight: Alice, Brave Bob's loyal friend, continually makes witty and ironic comments on what he does, using gentle and usually affectionate sarcasm.
 * Exaggerated: Alice speaks only in snarky commentary on Bob, on the universe, on passing cars, on what she had for breakfast that morning...
 * Justified: Alice has a very dry wit, and Bob's a moron.
 * Inverted: Alice is Sarcasm Blind.
 * Subverted: Alice makes a witty comment... then can't keep from laughing at her own joke.
 * Double Subverted:
 * She was actually laughing at someone else.
 * Alice's raucous laughter ends up being another piece of sarcasm as well.
 * Parodied: The character sprays acerbic wit all over everything - we do mean everything - and everyone loves it because it's funny.
 * Deconstructed:
 * Alice is hiding a deep inner hurt and uses sarcasm because she's afraid to get close to people.
 * Alternatively, the snarker being an asshole drives everyone else away from them, and they feel the burn.
 * Alice is a Stepford Snarker.
 * Reconstructed:
 * ...but when Bob calls her on it, she smirks and says "I knew you would say that," and they come to an understanding.
 * They don't care that they're driving everyone away, or thrive on it.
 * Zig Zagged: Sometimes they snark, sometimes they don't.
 * Averted: Characters mean what they say most of the time.
 * Enforced:
 * "This is a show full of idiots, and one smart, annoyed person."
 * "This character's kind of a jerk, so let's reinforce that image."
 * "...This is a show about making fun of people. Apparently, you were expecting Sesame Street."
 * Lampshaded: "Ooh, yay. Another dipshit that thinks he's Mike and this is MST3K."
 * Invoked: "I want to be the sort of person who always has something witty to say."
 * Defied: "I should be sincere so people don't think I'm a Jerkass."
 * Discussed: "Alice always has something snarky to say."
 * Conversed: "There's always someone on a show like that to snark at the antics of everyone around her."

Deadpan Snarker: A link for the people who have evolved past the much-too-difficult practice of "looking at the above links".