This is the original Uzume Tennouboshi, nicknamed Kurome Ankokuboshi by both the regular and older Neptune. She was the Console Patron Unit (CPU) of Planeptune before Uranus and Neptune. However, she sealed herself away because she could not control her powers. Coming to hate Gamindustri, the source of her power shifted from Share Energy to Negative Energy. Becoming consumed by the Negative Energy, she desired to break free from her seal to have her revenge. Her remaining Share Energy eventually split from her and took on the form of another Uzume Tennouboshi.
Technically, her true name is "Tennouboshi Uzume" and "Ankokuboshi Kurome" is just a nickname that Adult Neptune came up with and the other characters also started using.
