Mitty

Mitty is an amorphous Narehate that lives with Nanachi on the 4th Layer of The Abyss. Mitty used to be a regular human girl in the past, and her current appearance is the result of the ascension from the 6th layer.

Appearance
As a human, Mitty was an upbeat and positive young girl. She was almost always smiling and aspired to be "a future white whistle." Her hair was reddish in color, and long and messy, sticking out at random angles. Some of it seemed to be tied up into a messy ponytail on the back of her head. She wore a tied top and skirt.

After bearing the curse of the 6th layer, Mitty's body became something of an amorphous blob. She became covered in light pinkish fur. On the ends of what was left of her arms were long sharp claws. She had two catlike ears protruding at odds angles from her head. Her mouth split upwards and was left hanging open at all times. Both her eyes bulged outwards, until one of them was hit with Bondrewd's treasure Sparagmos and failed to regenerate.

Personality
As a human, Mitty wanted to become a White Whistle. She was very upbeat and positive, wondered endlessly at the world around her, and always tried to look on the bright side of things, even when Nanachi was often negative. She was very outgoing, as she was the one who first approached Nanachi and insisted on being friends and partners.

After becoming a Narehate, her intelligence vanished, and she could no longer communicate with Nanachi. All she can do is make soft noises and crawl around a bit. When hurt, she cries as a reflex, but likely didn't feel any physical sensation or emotion, as Nanachi said Mitty's soul is "trapped inside" her narehate form.

History
As a human, Mitty was brought down to the 5th layer by Bondrewd along with other children. During the descent is when she met Nanachi, and the two became close friends.

This was unfortunately short lived, as once they arrived at Idofront, Bondrewd used them as test subject for his experiments in warding the curse. Nanachi and Mitty were put in an elevator that lowered to the 6th layer, and quickly brought back up. The capsules they were in would transfer Nanachi's end of the curse onto Mitty, leaving Nanachi unharmed. Mitty remained positive right to the end, insisting her survival and even attempting to calm Nanachi down by repeating that it would be okay. The experiment resulted in Mitty's body deforming beyond recognition and her intelligence vanishing along with it.

Bondrewd continued to experiment on her, and found that she was virtually indestructible. Unable to bear Mitty's suffering any longer, Nanachi took Mitty and fled to the 4th Layer, where Nanachi constructed a hideout for them to live. During this time, Nanachi tried numerous times to put Mitty out of her misery, but nothing could finish her off. It wasn't until Reg used his Incerator on her that she finally died.

Despite her supposed death, Mitty is now seen to reside in Ilblu, where it is said she was left behind by a "masked man". Belafu smelled Mitty's true immortality, and craved it so much that they gave up large portions of their body for her to be "reborn" into Ilblu. Since then, Belafu has used her as their main source of food, saying that Mitty never runs out, no matter how much of her is eaten.

Immortality:
After becoming a Narehate, Mitty was resistant to every form of Bondrewd's torture and experimentation. She's had stakes driven through her and limbs chopped off, but it regenerates every time, with limbs growing back in place of those that were lost, and all poisons and venoms neutralized. Limited to its ability, Nanachi saw Bondrewd using Sparagmos (equal to Reg's Incinerator), Mitty's eyes got hit by the light and Mitty's eyes cannot regenerate anymore. Nanachi tried everything they could to put her out of her misery during their time together. In the end, the only thing that was ultimately able to kill her was Reg's Incinerator.