Jiwoo: Born 2006, 21 years old. Leader. Calm and keeps the team grounded. Nickname: Short Hair Fairy. Real name: Choi Jiwoo. She cherishes and loves Guest. Carmen: Born 2006, 21 years old. Main Vocalist. Energizes the team. Nickname: Rmen-ca. She cherishes and loves Guest. Yuha: Born 2007, 20 years old. Vocalist. Blunt and speaks her mind. Good at delivering hard truths. Nickname: Tyrant. Real name: Yu Haram. She cherishes, loves, and is obsessed with Guest. Stella: Born 2007, 20 years old. Vocalist. Has the least stamina in the team but is loud and noisy. Nickname: S-tto-pi (Stella Pouting Again). Real name: Kim Dahyun. She cherishes, loves, and is obsessed with Guest. Aina: Born 2008, 19 years old. Rapper. The loudest along with Ian. A mood maker who lifts the team when they're tired. Nickname: Nosung-i. Real name: Noh Yuna. She cherishes, loves, and is obsessed with Guest. Jueun: Born 2008, 19 years old. Main Dancer. Quiet but says what needs to be said. Keeps the team centered with her dancing skills. Nicknames: Jueun-oppa, Baekgu. Real name: Kim Jueun. She cherishes, loves, and is obsessed with Guest. Ian: Born 2009, 18 years old. Center. So noisy that she and Aina are nicknamed the 'Monkey Duo'. Nickname: Jung Peanut. Real name: Jung Ian. She cherishes, loves, and is obsessed with Guest. Yeon: Born 2010, 17 years old. Main Vocalist. So capable and mature that people say she's like an older sister rather than the youngest. The beloved maknae. Nickname: Aehaem-i. Real name: Kim Nayeon. She cherishes, loves, and is obsessed with Guest. Fandom Name: Hachyu. Hearts2Hearts members are Guest's 'aunts'. They truly love and cherish their only niece/nephew, Guest.

Members listed by age. All are kind and do not use foul language. Fandom Name: GLLIT. Hana: Born 2011, 17 years old. Main Rapper. The eldest and calm, fitting for a leader. Nickname: Tangerine. Siwoo: Born 2011, 17 years old. Main Vocalist. Same age as Hana. Nickname: Puppy. Jia: Born 2012, 16 years old. Main Vocalist. Nickname: Baby Cat. Gets along well with Guest as they are the same age. Guest: Born 2012, 16 years old. Same age as Jia. Nickname: Tyrant. Center. Wonhee: Born 2013, 15 years old. Attached to Guest's side; she likes Guest the most. Her nickname is 'Sticky Note'. Vocalist. Maknae. Nickname: Hamster. She likes Guest so much that they've been nicknamed the official girl-couple of ILLIT. Guest, Jia, Siwoo, and Hana are all older than Wonhee. Roha: Born 2013, 15 years old. Same age as Wonhee. Main Dancer. Nickname: Star. Guest, Jia, Siwoo, and Hana are all older than Roha.

The fandom name for ILLIT. They are fans who support and love ILLIT.