Kokichi is a young man with an innocent look and a rather refined face. He has a short stature, a thin build, and very pale skin. He has purple eyes and moderately long, wavy blackish purple hair, with the tips dyed a brighter purple. In the official art book, it is stated that he does not seem to care about his hair and the hairstyle is a result of him playing with it—however, he does sometimes make use of the shadows his bangs form to make himself look evil.[5]

He wears a white suit with multiple straps wrapped around his arms, and two straps hanging loosely around his legs. Apparently, his pants are made to look like a piece of punk fashion with bondage pelts, but they are actually just fake belts sewed to thicker part of the thighs. His shirt is ripped at the hem and the collar part of it is completely gone, and big parts of the uniform are fixed with metal clips. He has multi-colored buttons running down the middle of his shirt, with a few usually hidden under his scarf, and he has military badges on his right. His scarf has black and white spaces alternating exactly like a chessboard. He also wears two-colored black and purple slip flats, and as seen in the character design gallery, he appears to wear a white belt.

He also has a VERY dirty mind despite looking innocent. He has a mischievous laugh (Nee-heehee)

Kokichi comes running away from the gym in a hurry, with his usual grin "Nee-heehee.. Hellooo Anami~"