Nanachi

Nanachi is a Narehate, a survivor of ascension from the sixth level of the Abyss. Due to certain circumstances, Nanachi was able to keep her personality and mental faculties intact. Her body, however, was deformed beyond recognition from Her original.

Nanachi looks very young but her vast knowledge of the physics and ecology of the Abyss seems to suggest she has lived there for quite a while. She also appears to be an amateur medic with significant surgical skills and an extensive knowledge of medicinal plants and animals. Despite this knowledge of the world of the Abyss, her cooking is pretty awful.

Appearance
Nanachi's appearance is very rabbit-like, save for a long sturdy tail. Medium tan fur covers her entire body, with light tan being on two spots on her cheeks, the insides of the ears, and on the belly. Nanachi has straight white hair in a short bobbed style, with the sides of the bangs being much longer. Her eyes are yellow with the pupils being horizontal ovals, similar to a goat's. Her fingers are rather stubby.

Personality
Most of the time Nanachi is cool and reserved, keeping her distance emotionally and physically. Her attitude often borders on being sarcastic and even cynical, however behind this mask Nanachi hides a kind and gentle soul capable of deep compassion and selfless devotion. She is also quite bashful when complemented, seen in her reaction to being called "fluffy".

History
Not much is known about Nanachi's past—She was born in the Far North region of Sereni, lost her family and home at a young age, and was taken to the Abyss by treachery, along with many other children. Bondrewd was working on experimenting with ways to negate the curse of the abyss, and using children as his test subjects. While in the Abyss, Nanachi met Mitty, another child taken by Bondrewd, and the two became close friends. Nanachi and Mitty were best friends, until Mitty was chosen to be experimented on. Nanachi, worried for Mitty, followed and Bondrewd decided to use the two as test subjects because of their strong relationship. Each were placed in separate connected capsules, lowered to the 6th layer, and then quickly brought back up. The capsules were designed to transfer the curse onto only one subject, while the other received what Bondrewd called the blessing instead. Both survived and became Narehate (a hollow) but Nanachi retained her humanity, since the curse was transferred to Mitty, while Nanachi received the “blessing“.

Nanachi, in her new Narehate form, continued to work for Bondrewd at Idofront until she escaped with Mitty on her back, unable to bear the horrible experimentation Mitty was subjected to any longer. Nanachi lived with Mitty in the fourth layer for some time. They experimented on dying divers to figure out a way to kill Mitty. The bodies of these divers are buried in a graveyard behind their hut. Nanachi is careful to not reveal herself because divers murder Narehate (hollows) they come across.

But, Nanachi does reveal herself to Riko and Reg after she see's Reg crying over Riko's body. Because their relationship closely resembled Nanachi's relationship with Mitty, they aid them and eventually follow them to bottom of the Abyss after Mitty is released.

Abilities
On top of top-notch tracking and stalking skills, since becoming a Narehate (a Hollow), Nanachi has been able to see the flow of the curse throughout the abyss, thus being able to avoid it. Nanachi is very knowledgeable about the different plants and animals, and which can be used as medicine or food.

Trivia

 * Nanachi is generally presumed to be female, but their gender are never explicitly stated, and when talking about themself Nanachi uses the gender-neutral pronoun "oira." Tsukushi confirmed this by tweeting out "The sex of Nanachi is unknown. Let's imagine :)." Series translator Jake Jung has elected to use neutral pronouns for Nanachi.
 * Nanachi has an "irresistible fragrance". In particular, the base of their tail smells really good.