Nanachi

Nanachi is a Narehate, a survivor of ascension from the 6th Layer of the Abyss. Due to certain circumstances, Nanachi was able to keep their personality and mental faculties intact. Their body, however, was deformed beyond recognition.

Nanachi looks very young, but their vast knowledge of the physics and ecology of the Abyss seems to suggest they have lived there for quite a while. They also appear 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, their cooking is pretty awful.

Appearance
Nanachi's appearance is very rabbit-like, save for a long sturdy tail. Medium tan fur covers their entire body, with light tan being on two spots on the 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. Their eyes are yellow and the pupils are horizontal ovals, similar to a goat's. Their fingers are rather stubby.

They typically walk upright, but sometimes they'll run on all fours when they're trying to move quickly.

Personality
Most of the time Nanachi is cool and reserved, keeping their distance emotionally and physically. Their 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. They are also quite bashful when complemented, seen in their reaction to being called "fluffy".

History
Not much is known about Nanachi's past—They were born in the Far North region of Sereni, lost their 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 and was led out by Bondrewd. Worried for Mitty, Nanachi followed, until being discovered. Bondrewd then decided to use the two as test subjects together 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. Both survived and became Narehate (a hollow) as a result, but Nanachi retained her humanity, since the curse was transferred to Mitty, while Nanachi received the “blessing“.

Nanachi, in their new Narehate form, continued to work for Bondrewd at Idofront, helping him to create Cartidges. Unable to bear the horrible experimentation Mitty was subjected to any longer, Nanachi escaped Idofront with with Mitty on their back. The two traveled up to the 4th layer, where Nanachi found a spot away from the Abyss' vertical shaft where the force field was not present, and constructed a hideout there. Nanachi lived peacefully with Mitty in the fourth layer for some time. Sometimes delvers would pass through the area, and fearing that word of them may get out, Nanachi was careful to not reveal themself, and instead would watch from a safe distance. Occasionally, when a delver was wounded beyond help, Nanachi would take them in and experiment on them, hoping to find a way to kill Mitty. The bodies of these delvers are buried in a graveyard behind their hut.

Nanachi does reveal themself to Riko and Reg after seeing Reg crying over Riko's body. Because the two's relationship reminded Nanachi's of their relationship with Mitty, Nanachi decided to aid them. During their stay Reg demonstrated the power of his Incinerator, which reminded Nanachi of Bondrewd's relic Sparagmos; the only thing that had been able to permanently damage Mitty. Seeing the opportunity, Nanachi asked Reg to kill her, to which he reluctantly agreed. After Mitty's soul was released, Nanachi decided to join Riko and Reg on their journey to the bottom of the Abyss.

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. They are also a decently qualified medic, and are able to perform a number of minor surgeries. Many of the methods they use are unknown to delvers, showing of their knowledge of the land.

Nanachi is also shown to be somewhat artistically talented, having drawn pictures of themself, Mitty, Reg, and Riko, a representation of how the curse works, and accurate depictions of the things Reg was to fetch to help heal Riko's arm.

Trivia

 * Nanachi is generally presumed to be female, but their gender and sex are never explicitly stated, and when talking about themself Nanachi uses the gender-neutral pronoun "oira." Tsukushi commented on their sex 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.
 * When signing their name, they always draw a picture of their face with the characters for "Nanachi" underneath.
 * Occasionally there are extra pages at the end of chapters that give more detailed descriptions of the creatures and relics seen. Nanachi often shows up on these pages giving their own insight on the subject. These small bits are called "Nanachi's Trivia."