|“||If you stopped being a Kira master, where would that leave you? Who are you?||”|
–Itsuwari to Yoite, Chapter 47
Itsuwari has long, light hair and is seen wearing matching outfits with his twin sister, Makoto. This outfit consists of a beanie with an argyle pattern, a dress shirt and tie, a sweater vest, cargo pants, tall boots, and a long, hooded coat with matching argyle accents around the cuffs. They are often also seen with umbrellas.
It would appear that he is in his teens, also refering to Yukimi as a "stupid grown-up," indicating that he himself is still a child.