Nakime

Nakime is a mysterious Biwa Demon that dwells in the Dimensional Infinity Fortress. Actually she is a member of the Twelve Demon Moons, replacing Hantengu and holding the position of Upper Moon Four.

Appearance
Nakime had her Bangs covering most of her face. If the bangs were removed, it'll show her face, with cyclops-like mono eye.

Personality
Overall, Nakime is depicted as a mysterious yet cold biwa player who doesn't speak a word unless it is absolutely necessary. Her emotions are never shown, and on the rarer occasions when she does speak, she is often straightforward and blunt, making her responses as short as possible.

Functional Recovery Training Arc
Nakime makes her debut within the Infinite Dimensional Fortress playing her biwa, summoning the Lower Moons for a meeting following Rui's death. She does not utter a word.

Red Light District Arc
Nakime - once again - plays her biwa and summons the Upper Moons to a meeting after Daki and Gyutaro's deaths.

When questioned by Akaza as to where Muzan Kibutsuji is, she replies straightforwardly that he has not yet arrived. She is also questioned as to where Upper Moon One is, to which she replies (after Akaza's and Doma's bout) that he has always been there; he was the first to arrive.

At the end of the meeting, Nakime plays her biwa again and bluntly refuses Doma's cut-off offer.

Pillar Training Arc
Nakime, now revealed as the new Upper Moon Four replacing Hantengu, is shown near Kibutsuji Muzan. Expressing her honor at Muzan's compliment, she uses her technique to locate the hunters along with Nezuko upon his orders.

Abilities and Powers
She has not been shown to fight anyone thus far,but it is expected that like all demons, she possesses superhuman levels or at least above average of physical strength and incrediable regeneration and heightened senses.

Fortress Manipulation
Nakime possess the ability to manipulate and control a seemingly infinite inter-dimensional fortress, being capable of bringing anyone she desires into the fortress and is capable of creating entrances and exits anywhere she desires, and by binding and rooting her hair to a nearby wall inside the fortress she can control the Fortress's positioning as she likes, shifting and changing the positioning of various rooms and walls as she pleases,However doing this will render her Immobile.

Eye Detachement
Later upon obtaining the Rank of Upper Moon Four and presumably receiving more blood from Muzan, she has now displayed the new ability to create and detached several Eyeballs from her body allowing her to spy on others from long range, with this new ability it was possible for her to successfully find and locate the locations of nearly all members of the Demon Hunters Corps all across Japan and locate their hidden base.

Quotes

 * "I refuse." Chapter 99, page 9.
 * "I am very honored." Chapter 134, page 19.