The Count does not have transcendence, so he is Violet, and counts things,
and drops the top-most register of his voice.

Grover does not have intellect, so he is Indigo, and asks questions,
and drops the almost-top register of his voice, keeping the highest.

Cookie monster cannot communicate, so he is Light-blue, and likes to eat,
and drops the just above middle register of his voice.

Big bird does not have power, so he is Yellow, and likes friendship
and drops the middle register of his voice.