Kona's body is that of a somewhat short, boyish girl, with dark black-grey skin and prominent, lighter grey freckles on her face. Her hair is a lighter shade than her skin, but still an overall dark grey in coloration, and is in a boyish bob cut, and has a glowing orange coloration that lets off embers closer to the tips. The inside of her mouth is a pale grey and her teeth are white, while her remaining non-Void eye is yellow in coloration. A long white fuse that's lightly lit on the end runs from the back of her head like a ponytail. Her outfit's top consists of a black vest with prominent, bat wing-like lapels and four silver buttons in the shape of pointy crosses with little skulls at the center, and underneath it she wears a horizontally striped black and light grey long sleeved shirt. On her hands she wears simple white gloves with two black black cross-shaped holes on the top of each glove, though the gloves are lightly soot covered. On her waist and upper legs she wears cute white pumpkin pants, with each pant leg styled off a cut skull with black eyes, and she has a simple black belt with a silver skull buckle, and a box of matchsticks on her left side. Over her legs she wears vertically striped light grey and black leggings and simple, cute black boots with three straps ending in buttons themed off little silver skulls on each. Finally, she wears a black beret with a skull design on it (with a smaller skull in its right eye) in white, with a hole poked through the top for her fuse to run though. She has a short yellow cape over her shoulders, held in place by black, skull-like shoulder pads. Her incognito outfit consists of a black T shirt with a cartoon bomb on the front, with a horizontally striped black and white long-sleeved undershirt beneath it, plus a simple yellow backpack. On her waist and legs she wears somewhat loose jeans and black and yellow sneakers, while she has simple yellow fingerless bike gloves on her hands. She wears a similar beret on her head, but without a skull symbol on it.

Her invitation read: "To the infamous Kona Kuroi, we hereby invite you to the Calling, the festival which crosses all worlds. Should you partake of our offer, you will discover new lands to experience and explore, new treasures to add to your hoard, new fortresses waiting to be penetrated, and most importantly, new friends which who you can safely rely on without fear. Sign your name below, and the door shall open for you."