Bastarz is the first official sub-unit of the South Korean boy group Block B. Established in April 2015, the sub-unit consists of three members: B-Bomb, U-Kwon and P.O. The sub-unit debuted with their first mini album, entitled Conduct Zero, on April 14, 2015.

Stage Name: B-Bomb/비범
Real Name: Lee Minhyuk/이민혁
Birthday: December 14, 1990
Birthplace: Seoul, South Korea
Blood Type: A
Height: 178 cm
Weight: 60 kg
Position in group: Leader, Main Dancer, Lead Vocalist
Languages: Korean
Instruments: piano
Hobbies: playing the piano, collecting fashion photo shoots
Education: Induk University, Major in Broadcasting
Fans: Dimples

Stage Name: U-Kwon/유권
Real Name: Kim Yukwon/김유권
Nicknames: Smiling Representative of Block B
Birthday: April 9, 1992
Birthplace: Suwon, South Korea
Blood Type: A
Height: 176 cm
Weight: 63 kg
Position in group: Main Vocalist, Lead Dancer
Languages: Korean
Instruments: guitar
Hobbies: watching movies, listening to music, reading
Siblings: older brother Yushin
Education: Anyang Technical High School
Fans: Kittens

Stage Name: P.O/피오
Real Name: Pyo Jihoon/표지훈/表志勳
Birthday: February 2, 1993
Birthplace: Seoul, South Korea
Blood Type: B
Height: 181 cm
Weight: 64 kg
Position in group: Main Rapper, Vocalist, Maknae
Languages: Korean
Hobbies: acting
Education: Hanlim Arts High School
Fans: Pearls