Sage is a parody of people who follow the New Age culture.
Sage, although cursed with the lemur stupidity like many others, is dumber than the average lemur. Sage's character is that of a dumb blond/dumb jock.
In Koto, Plain and Tall, Sage is revealed to be a first-born prince and that his birth name was "Babak." He is also revealed in the episode to be a Mountain Lemur, and is shown for the first time being sarcastic and angry.
