Timothy's Innocence, a Parasitic type, is centered in the jewel in his forehead. It allows him to take control over other people.

Tsukikami's current form is based on an adult version of Timothy's own body, something Tsukikami has confirmed he purposefully did for the sake of convenient communication.

Tsukikami has a ghost-like shape of a tall man in the mid-twenties. He has the same haircut as his host, Timothy, but purple colored, pointy ears, and white skin with navy-green markings: cross on the forehead (with the vertical line ending on the bridge of his nose), characteristic markings under the eyes, and marked upper lip. His nails have the same color.

Tsukikami wears loose white kimono (with Japanese character in the front) fastened with stripped purple obi and blue-white thick rope. His pants have blue and white checker pattern. Tsukikami is barefoot.

(Source: D.Gray-Man Wikia)