That

that is a famous who has been on Nico Nico Douga since early 2008. He is well known for his thin and high-strung mid-to-high-ranged voice.

He was also a vocalist in the professional music group "absorb", comprised of three members: halyosy, is and that himself, before they disbanded in December 2010.

Recently, he has also started making VOCALOID songs.

Discography
For G.W. Nicolai albums see here For Absorb albums see here

Trivia

 * He runs a cafe in Tokyo called whim's.
 * He currently lives in Tokyo.
 * He owns 2 rabbits named Capu-chan and Chame-kun.
 * He visited the Phillipines in May 2012 for VocaFusion, a Filipino VOCALOID event.
 * He has a younger brother.
 * He went back to the Philippines for the second time for a live performance on February 02, 2013. He was accompanied by [MINT]'s pianist, Akai Ryuusei.