Purple

From Muppet Wiki

The Purple Anything Muppet is a purple rod puppet.

Examples of the Sesame Street characters developed from the Purple Anything Muppet include:

Bip Bippadotta	Christopher Columbus	Dew Drops singer	Five People in My Family brother
The Hipster	Purple Monotone	Roosevelt Franklin's Mother	Spaceship Surprise: The Next Generation Captain
Teresa	Tito