Izumo Kusanagi (草薙出雲, Kusanagi Izumo) is the oldest member of HOMRA, putting his strength just beneath Mikoto Suoh's.
Izumo is a tall, slim young man with short blonde hair and brown eyes. Izumo typically wears a long sleeved white shirt with an upturned collar, usually including a red scarf or a black scarf around it, under an opened black jacket. He wears blue jeans held up by a brown belt with a unique, layered buckle, and black shoes, which are adorned with a white padding on the nose.
Izumo is a very composed individual, reacting calmly even in dangerous or extreme situations. He retains this trait even when in the midst of a battle. However, because of his nature, others often tend to be intimidated by him. Additionally, he is quite intelligent and knowledgeable of the people or things around him. Izumo has a fairly extensive knowledge of people's backgrounds. Izumo is an avid smoker, and speaks in the Kyoto dialect.