He has short auburn hair (which was originally black, as seen in the old group picture) and green eyes. He is tall and quite muscular. He usually wears a grey-purple shirt and black trousers. When in Trigger Mode, he gets a grey-blue shirt with the Tamakoma Branch symbol on the sides of the sleeves, a black flak jacket, black military pants, and combat boots.
Reiji is a very calm and serious individual. He can be very strict, as shown when he scolded Chika for forgetting the basics of being a sniper, though she proved him wrong by showing him she didn't. The only case in which he has been shown to lose his cool is when Yuri is around.