Avenue Q/Characters

Puppets

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.

Back From the Dead: With her virginity intact, too.
Buxom Is Better
God Is Good: Apparently, He revived her as a chaste woman. It's all Played for Laughs, natch.
Ms. Fanservice
My Girl Is a Slut: Well, duh.
Really Gets Around

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

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

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