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Seijuurou Kusanagi (清十郎草薙 Kusanagi, Seijuurou) is the oldest of the Kusanagi family, being seventy years old.
Seijuurou has thining hair, almost none on the top of his head, it travels around the back and behind his ears and black eyes. His clothes vary on wear he is, at home he wears simple underwear and when he was at the hospital simple black pants with a light waist and a light robe.
Chiwa states that Kyousuke has a nasty look in his eyes, just like his grandpa. Seijuurou is violent, repeatedly shown hitting his grandchildren, but still cares. He enjoys japanese culture, seeming to be teaching it Luchiru.