This is just my opinion and from what other people been saying
Leader: Koeun
Main Vocal: Ningning/Jungyeon
Main Dancer: Hina
Main rapper: Lami/Hina
Sub/lead rapper: Hina
Center: Lami/Hina/Koeun
Lead vocal: Koeun
Sub Vocal: Hina/Lami
Face of the group: Lami/Koeun
Maknae: Lami