Twice is a South Korean girl group formed by JYP Entertainment through the 2015 reality show Sixteen. The group is composed of nine members: Nayeon, Jeongyeon, Momo, Sana, Jihyo, Mina, Dahyun, Chaeyoung, and Tzuyu. The group debuted on October 20, 2015 with the extended play The Story Begins.

Stage Name: Nayeon/나연
Real Name: Im Nayeon/임나연/林娜妍
Birthday: September 22, 1995
Birthplace: Seoul, South Korea
Blood Type: A
Height: 164 cm
Weight: 47 kg
Position in group: Lead Vocalist, Lead Dancer, Center
Languages: Korean
Hobbies: watching movies and dramas, watching Song Triplets videos
Education: Kangdong High School; Konkuk University, Major in Film

Stage Name: Jungyeon/정연
Real Name: Yoo Jungyeon/유정연/俞靜延
Nicknames: dad of TWICE
Birthday: November 1, 1996
Birthplace: Suwon, South Korea
Blood Type: O
Height: 169 cm
Weight: 49 kg
Position in group: Lead Vocalist
Languages: Korean
Instruments: saxophone
Hobbies: watching mukbang videos
Siblings: older sister actress Gong Seungyeon, older sister Seoyeon
Education: Apgujeong High School

Stage Name: Momo/모모
Real Name: Hirai Momo/平井 もも
Nicknames: mom of TWICE
Birthday: November 9, 1996
Birthplace: Kyōtanabe, Kyoto, Japan
Blood Type: A
Height: 164 cm
Weight: 48 kg
Position in group: Main Dancer, Vocalist, Rapper
Languages: Japanese, Korean
Hobbies: watching dramas and movies, nail art, shopping, looking at photos of food while on a diet
Siblings: older sister

Stage Name: Sana/사나
Real Name: Minatozaki Sana/湊崎 紗夏
Birthday: December 29, 1996
Birthplace: Tennōji-ku, Osaka, Japan
Blood Type: B
Height: 165 cm
Weight: 48 kg
Position in group: Vocalist
Languages: Japanese, Korean
Hobbies: collecting perfume, eating, shopping

Stage Name: Jihyo/지효
Real Name: Park Jisoo/박지수/朴智秀
Birthday: February 1, 1997
Birthplace: Guri, Gyeonggi-do, South Korea
Blood Type: O
Height: 161 cm
Weight: 49 kg
Position in group: Leader, Main Vocalist
Languages: Korean
Hobbies: online shopping, walking
Siblings: two younger sisters

Stage Name: Mina/미나
Real Name: Myoui Mina/名井 南
Nicknames: Black Swan
Birthday: March 24, 1997
Birthplace: San Antonio, Texas, United States
Blood Type: A
Height: 163 cm
Weight: 46 kg
Position in group: Main Dancer, Vocalist
Languages: Japanese, Korean
Hobbies: finding good restaurants, shopping
Siblings: one older brother
Education: Obayashi Sacred Heart School

Stage Name: Dahyun/다현
Real Name: Kim Dahyun/김다현/金多賢
Birthday: May 28, 1998
Birthplace: Seongnam, Gyeonggi-do, South Korea
Blood Type: O
Height: 158.6 cm
Weight: 48.9 kg
Position in group: Lead Rapper, Vocalist
Languages: Korean
Instruments: piano
Hobbies: listening to music, playing the piano
Siblings: one older brother

Stage Name: Chaeyoung/채영
Real Name: Son Chaeyoung/손채영/孫彩英
Birthday: April 23, 1999
Birthplace: Seoul, South Korea
Blood Type: B
Height: 158.9 cm
Weight: 48 kg
Position in group: Main Rapper, Vocalist
Languages: Korean
Hobbies: listening to music, drawing
Siblings: one younger brother

Stage Name: Tzuyu/쯔위
Real Name: Zhou Ziyu/周子瑜/Sally Zhou
Nicknames: Chocolate, Yoda
Birthday: June 14, 1999
Birthplace: Tainan, Taiwan
Blood Type: A
Height: 172 cm
Weight: 48 kg
Position in group: Lead Dancer, Vocalist, Visual,  Maknae
Languages: Chinese, Korean
Hobbies: eating, watching performances
Siblings: one older brother