Nemu

Nemu is a young girl with a slender figure and green eyes. In her childhood, she has untidy hair and wear a white kimono.

Because she was abused and mistreated in every possible way by her "father/creator", Mayuri, Nemu is a very shy, withdrawn, and introverted individual, preferring to stay silent in her captain's presence. Her expression is almost always melancholic, and it is rare to see her smile or show any real joy in her distinctive green eyes. Despite Mayuri's seeming lack of care for her existence, she is very loyal to him, willing to badly injure herself just to give him an advantage in battle.

Being the daughter of Mayuri, they share several similar traits. One such trait is their food preference. Nemu, just like her father, likes pike fish and dislikes onion. They share an interest in Human experimentation and their main free-time activity, which is reading every single character published in Seireitei Communication.

Nemu was created as the seventh incarnation of the Nemuri Project, which aimed to create new souls from "Konpaku cells". When Nemu was a child, she told Akon that Mayuri did not call her by the original designation that he had given her, surprising him. Akon expressed that maybe she should ask Mayuri, but Nemu stated that she already determined that he would not answer her. After berating Nemu for asking him when he clearly does not know, Akon theorized that Mayuri was embarrassed about his feelings and relayed what he had said about the Nemuri Project before clarifying that Mayuri would be embarrassed if Nemu realized that her growing up day by day is like living in a dream for him. Nemu asked him if Mayuri would return to calling her by her original designation if she remained ignorant, but Akon claimed that remaining in such state would be impossible as she was Mayuri's masterpiece and would obviously evolve.