Cindy Hayes - Outgoing with a large personality, she is often the heart and soul of the group, and is the one with the fewest moral dilemmas. She is often selfish and easily swayed into action by her greed rather than any sense of right or wrong.
Tasha "Taystee" Jefferson - Best friends with Poussey, and is shown to have a high level of influence over the others. Known as the "mother" of the group.
Janae Watson - Was invited during her transition into prison life, she is close to the group and doesn't like to stray far from them.
Suzanne Warren - Extremely eccentric, she is often tolerated rather than genuinely liked. She was emotionally manipulated by Yvonne Parker, and often dreams about her. The girls often wonder why they are still friends with her after she attacked Poussey Washington, but feel a degree of responsibility towards her and act to calm her down so she doesn't end up back in Psych.
Brook Soso - Brook was welcomed to the group after Poussey found her passed out after a suicide attempt with anti-histamines. The group helped Soso recover and kept the episode quiet to prevent her being taken to Psych. Poussey and Soso had a romantic relationship together and talked about planning their lives together after they got out.
Alison Abdullah - Alison was assigned as Cindy's bunkmate in Season Four. The two were initially antagonistic towards each other, but eventually bonded due to the fact that the other black girls liked Alison, and that they discovered they shared a love of the same book.
Yvonne Parker (deceased) - She tested the bonds between all of the girls, and forced them to create a drug cartel inside the prison. She ordered Suzanne to attack Poussey. She was the maternal figure for Taystee, and later assumed a similar role for the emotionally vulnerable Suzanne.
Poussey Washington (deceased) - She was best friends with Taystee. She was usually the moral voice of the group and stuck strongly to her moral code, even if it alienated her. She was seen to struggle with her feelings towards Taystee, whom she loved as more than just a friend. She was killed in Season Four when a peaceful protest at the prison turned violent due to the actions of the guards.
Sophia Burset (former) - Sophia was shown to be a large part of the group in Season One, but throughout the rest of the show drifted apart until she was no longer seen with them.