Koseki is a Raytraxian sphinx moth. It has locks of hair around its body, especially on the chest, and crystal veins. It has two large "eyes" on the sides of the head, large, feathery antennae on the front and two ear-like structures on the back. In addition, it has two wings on the back and a narrow abdomen. his fluffy antennaes have a cyan gradient that occupies more than half of these, his fur, antennaes and eyes are bioluminiscent and can change their colors depending on where you are. In normal areas with light it maintains its normal coat color (Copper Koseki) while in dark rooms during the day its coat changes to a strong red/orange tone and the coat of its legs, ears, and belly change to a cream color. While its antennae and eyes change to an intense orange color (Citrina Koseki). At night his fur changes to a dark bluish gray while his belly, ears, and legs change to a light bluish gray tone. Unlike his eyes and antennae that change to an indigo tone of cyan (Opal Koseki).