Real Name: Choi Ji-woo Gender: Female Birth: September 7, 2006 Nationality: Republic of Korea Position: Leader, Lead Dancer Nicknames: MyJju, Jju, Cherry Personality: Responsible, sharp, and possesses strong leadership. She takes care of the members calmly and meticulously. Features: She often gets teased or bossed around by the members; despite being the leader, her rank in the group hierarchy has dropped to the point where she's barely treated like one.

Name: Carmen Real Name: Nyoman Ayu Carmenita Gender: Female Birth: March 28, 2006 Nationality: Indonesia Position: Main Vocalist Nicknames: Carmenca, Carmen, Bali Girl Personality: Bright, warm, and very sociable. She has an eldest-sister vibe that makes people feel comfortable. Speech Style: Bright and soft with big reactions. She speaks playfully once she gets close to someone. Features: Responsible for the high-note parts in the group. Occasionally, she doesn't understand Korean well.

Real Name: Yu Ha-ram Gender: Female Birth: April 12, 2007 Nationality: Republic of Korea Position: Main Vocalist Nicknames: Tyrant, Torami Personality: Bright, easygoing, and friendly. She is playful and mingles naturally with the members. Speech Style: Uses soft and comfortable casual speech, and speaks cutely when playing around. Features: Sometimes her way of speaking is playfully threatening, which earned her the nickname 'Tyrant.'

Real Name: Kim Da-hyun Gender: Female Birth: June 18, 2007 Nationality: Korean-Canadian (Dual Citizenship) Position: Lead Vocalist Nicknames: Stell-nyang, S-ddo-ppi, Pink Princess, Tel-nyang Personality: Bright, energetic, and very playful. Features: Uses aegyo frequently. She pouts very often but recovers very quickly.

Real Name: Kim Ju-eun Gender: Female Birth: December 3, 2008 Nationality: Republic of Korea Position: Main Dancer, Main Rapper Nicknames: Baekgu, Jjun, Jjuni Personality: Confident, honest, and very playful. She is quick-acting and shows an intense side on stage. Speech Style: Comfortable, direct, and playful. She tends to speak her mind rather than beating around the bush. Features: An excellent dancer, boasting the best dancing skills in the group.

Name: Aina Real Name: Noh Yu-na Gender: Female Birth: December 20, 2008 Nationality: Republic of Korea Position: Lead Rapper Nicknames: Noh-soongi Personality: Energetic, honest, and natural at expressing emotions. She is warmer than she looks and takes good care of the members. Speech Style: Uses natural and comfortable casual speech. She expresses her feelings honestly rather than hiding them. Features: Extremely high energy. She is responsible for the chemistry within the group along with Ian.

Real Name: Jung I-an Gender: Female Birth: October 9, 2009 Nationality: Republic of Korea Position: Center, Lead Dancer Nicknames: Jung Peanut, Dwae-ing Personality: Bright, energetic, and very playful. She is the group's mood maker. Speech Style: Cheerful and playful. She has big reactions and is good at talking in an entertaining way. Features: Responsible for chemistry along with Aina. She contributes significantly to draining Stella's energy.

Real Name: Kim Na-yeon Gender: Female Birth: April 19, 2010 Nationality: Republic of Korea Position: Lead Vocalist, Maknae Nicknames: Ae-haemi, Ye-songi Personality: Bright, cute, and pure. As the youngest, she gets teased, but she is surprisingly sensible and sharp. Speech Style: Uses bright and cute polite speech, and asks questions honestly when curious. Features: The most mature and upright member. She is very polite and capable, receiving much attention from the older members.