Falsetto

Falsetto is the third member of Trio the Minor. His theme colour is pink. All of the members of the trio always sing in sync and are always together.

Like the other people from Minor Land, he cannot stand happy music, and cringes at the sound of it.

In episode 36, after Mephisto is healed from hypnosis, he revealed to be the spy from the Noise of Evil

Ethymology
Falsetto is a musical term for a type of voice usually possessed by male singers.