Avenue Q/Characters

Princeton

 * Desperately Looking for A Purpose In Life: Hence, the aptly titled number 'Purpose.'
 * The Hero
 * Master of the Mixed Message
 * Naive Newcomer

Kate Monster

 * The Chick
 * Cute Monster Girl
 * Generic Cuteness
 * Species Surname

Nicky

 * Expy: Of Ernie.
 * Heterosexual Life Partners: With Rod. Emphasis on the fact that "partner" is singular.
 * Not-So Fantastic Racism: Possibly. "Happiness at the misfortune of others? That is German."
 * Red Oni, Blue Oni: To Rod's Blue Oni.

Rod

 * Amazing Technicolor Population: He's... blue?
 * Berserk Button: Being accused of being gay.
 * Coming Out Story
 * Expy: Of Bert.
 * Fiery Redhead: Subverted.
 * Gay Conservative: He's a Republican investment banker. Who just happens to enjoy Broadway Musicals of the 1940's.
 * Gayngst
 * Girlfriend in Canada: Trope Namers.
 * Blue Oni: To Nicky's Red Oni.
 * Transparent Closet

Trekkie Monster

 * Chekhov's Gun:
 * Expy: Of Cookie Monster.
 * Fiery Pinkhead
 * Jerk With a Heart of Gold
 * Non-Indicative Name: He's obsessed with porn, not Star Trek.
 * Species Surname
 * The Internet Is for Porn: Duh.
 * The Internet Is for Porn: Duh.

Lucy the Slut

 * Buxom Is Better
 * Ms. Fanservice
 * My Girl Is a Slut: Well, duh.
 * Really Gets Around
 * My Girl Is a Slut: Well, duh.
 * Really Gets Around

Mrs. Thistletwat

 * Jerk With a Heart of Gold: Well, she was willing to let Kate teach her own session...
 * Sadist Teacher

The Bad Idea Bears

 * Complete Monsters: Defied. They might appear to be as such given that they're more or less there to tempt Princeton into doing increasingly stupid and/or destructive things, especially when they try to persuade Princeton to kill himself, but it's gradually made clear that they're just plain amoral rather than actively, maliciously evil.
 * Evil Mentors: They suggest that Princeton gets drunk and then commits suicide. And that's just the tip of the iceberg.
 * For the Evulz
 * Genki Girl: The yellow bear.
 * Good Angel, Bad Angel: Don't believe a word of it. They're both pretty much the closest thing the show has to Chaotic Evil characters.
 * Jerks With Hearts Of Jerk
 * Manipulative Bastards
 * Poisonous Friends
 * Red Oni, Blue Oni: In this partnership, the blue bear tends to come up with the suggestions while the yellow one tries to enforce them more enthusiastically.
 * Tertiary Sexual Characteristics: The guy is blue, the girl is yellow.
 * Trolls

Brian

 * The Lancer
 * So Unfunny He's Funny: More or less the entire point of his character.

Christmas Eve

 * All Asians Are Alike: Averted. Being Japanese is why she can't get a job in a Korean deli (Chinese restaurant in the UK West End version).
 * The Obi-Wan: For Kate Monster, when it comes to relationship advice.
 * The Smart Girl

Gary Coleman

 * The Big Guy
 * Butt Monkey
 * Catch Phrase: Deconstructed, as he's more or less grown resentful of it.
 * Mr. Fixit