Fukuwa (腹話) is an utaite with an extraordinary range and high flexibility with a clear and bright voice that can be suited to any song; however, he can change it to a deep, manly voice in a mere beat.
As presented in his cover of "Sou to Koi", he has an incredible control of his voice. He is even capable of doing screamos and death growls like in his "Until the BITTER END". He likes to add in many improvisations and effects to his covers.
However, as shown in his duet in "Honoo", he is able to sing in a normal and calm voice while providing as a proficient complementary singer.
He uploads slowly, from 1 to 5 covers per year and covers many Sound Horizon songs along with some VOCALOID songs. Most of his covers have easily surpassed the 100K mark and his most popular cover is his "Ura Omote Lovers" with over 4 million views as of September 2015.
He is very secretive - nothing is known about him except that he is male and middle-aged. Many fanarts of him consist of primarily a man with a distinct red jacket, black hair, black/red eyes and an eye or mouth on the palm of his hand and also his hair covered left eyes or mostly on his right eyes.
On July 2016 he started a bi-weekly radio called Nemimi ni Mizu Radio.